Explanation:

The length of a rectangle is three times its breadth. Waht is the perimeter of the rectangle (in meters) if its length is 48 meteres? Correct Answer 128 Here,l = 48, b = 16. So,perimeter = 2*(48 + 16) = 128

Explanation:

In how many years amounts of money will treple itself at a simple rate of interest is 20% per annum? Correct Answer 10 Let the principle be tk. x. So total amount = tk. 3x. so,interest = 3x - x = 2x

Explanation:

The circumference of a wheel is 6.25 meters. How many cycles will it make in order to cover a distance of 40km? Correct Answer 6400 Circumference of the wheel = 6.256.25 mDistance = 40 = 40 km = 40000 = 40000 mRequired number of cycles = 400006.25 = 6400

Explanation:

What amount of money (in TK) wil grow to Tk. 2380 in eight years if the simple rate of interest applied is 5% per annum? Correct Answer 1700 এখানে ১০০ টাকার জন্য, এক বছরে ৫ টাকা সুদ হলে ৮ বছরে হবে = (৫*৮) = ৪০ টাকা। এবং সুদ আসল হবে = (১০০ + ৪০) = ১৪০ টাকা এখন, সুদআসল ১৪০ টাকা হলে আসল = ১০০ টাকা ২৩৪০ টাকা সুদআসলের জন্য = ১০০*২৩৪০/১৪০ = ১৭০০ টাকা

Explanation:

A is 3 years older than C. B and D are twins. How older is c than D? Correct Answer 6 years Given:A = B + 3 = C - 3B = D (they are twins)⇒ B + 3 = C - 3⇒ D + 3 = C - 3 ⇒ C = D + 6Therefore, C is 6 years older than D.

Explanation:

If a deposit of Tk.750 earns simple interest @ 8% per annum and that of Tk. 1250 earns the same @6% per annum, what is the average rate of interest (in %) earned on the total deposit? Correct Answer 6.75 Interest on 750*.08 = 60 tk Interest on 1250*.06 = 75 tk So, total interest = 135 tk And, total deposit = 2000 tk Average interest rate = 135/2000 * 100% = 6.75%

Explanation:

A, B and C enter into partnership with investments in the ratio of 5 : 7 : 8. If, at the end of the year A's share of profit is Tk. 42360, how much is the total profit? Correct Answer Tk. 169,440 A's profit = 42,360 = 5x therefore x = 42,360/5 = 8472 total profit = 5x + 7x + 8x = 20x = 20*8472 total profit = 1,69,440 tk.

Explanation:

In a cricket match , five batsmen A, B, C, D and E scored an average of 36 runs. D scored 5 more than E, E scored 8 fewer than A, B scored as many as D and E combined, and B and C jointly scored 107. How many runs did E score? Correct Answer 20 A+B+C+D+E = 36*5 = 180D = E+5                E = A-8             B = D+E = E+5+E = 2E+5B+C = 107 or, C = 107-B = 107-2E-5 = 102-2EE+8+2E+5+102-2E+E+5+E = 1803E = 180-120E = 60 (Ans.)

Explanation:

There are deer and peacocks in a zoo. The total number of their heads is 80 and the total number of their legs is 200. How many peacocks are there? Correct Answer 60 Let x and y be the number of deer and peacocks in the zoo respectively. Then,x + y = 80 ...(i) and4x + 2y = 200 or 2x + y = 100 ...(ii)Solving (i) and (ii), we get) x = 20, y = 60.

Explanation:

At a dinner party , every two guests shared a bowl of rice between them , every three guests shared a bowl of vegetable among them and every four shared a bowl of meat among them . There were altogether 65 bowls. How many guests were present at the party? Correct Answer 60 Let the total number of guests be x. Then, Number of bowls of rice = 2x​ Number of bowls of dal = 3x​ Number of bowls of meat = 4x​ ∴2x​ + 3x​ + 4x​ = 65 ⟹126x + 4x + 3x​ = 65⟹1213x​ = 65⟹x = 60 Therefore, 60 guests were present at the party

Explanation:

A woman says, "If you reverse the digits my age, the figures represent my husband's age. He is senior to me and the defference between our ages is one-eleventh of their sum. "What is her age now? Correct Answer 45 years Let, the unit's digit of woman's age be 'y' and ten's digit be 'x' If so, the woman's age is = (10x + y) years and her husband’s age is = (10y + x) years. [Digits are reversed] ATQ, (10y + x) - (10x + y) = (10y + x) + (10x + y) (1/11) ‌‌or, 9y - 9x = (11y + 11x)/11 or, 9y - 9x = 11(y + x)/11 or, 9y - y = x + 9x or, 10x = 8y or, x = (4/5)y Clearly, y should be a single digit and multiple of 5, which is 5 [only possible value] Hence, y = 5 and x = 4 So, woman's age = (10x + y) = 45 years.

Explanation:

A tailor had a number of shirt pieces to cut from some large pieces of fabric. He cut each large piece into 10 smaller pieces. He cut at the rate of 45 cuts per minute . How many large pieces would be cut in 24 minutes? Correct Answer 108 Number of cuts made to cut a large piece into 10 pieces = 9. Therefore, Required number of large pieces = (45 x 24)/9 = 120.

Explanation:

One day at a school, one -twelfth of the students were absent and 20% of those present went on a field trip. If the number of students staying back in the school that day was 660, how many students are enrolled at that school ? Correct Answer 900 Student staying at the school is (100 - 20 = 80%) of the present students. 80% of the present students = 660 So, 100% or total present students = 660 x 100 / 80 = 825 But, present students = (1 - 1/12 = 11/12) of all enrolled students Now, 11/12 of enrolled students = 825 So,  all enrolled students = 825 x 12 / 11 = 900

Explanation:

If a person can save TK.380 in 5 weeks, in how many weeks, at this same rate, can the person save 2.6 times amount ? Correct Answer 13 Total savings will be TK. 380x2.6 or TK. 988 So in one week he can save TK. 380/5 or TK. 76 Number of weeks need for saving TK. 988 is 988/76 or 13

Explanation:

2 large and 1 small pumps can fill a water tank in 4 hours. 1 large and 3 small pumps can also fill the same water tank in 4 hours . How many hours will it take for 3 large 4 small pumps to fill the tank? Correct Answer 2 hours Here, 2 large and 1 small pumps ≡ 1 large and 3 small pumps Again, 3 large and 4 small pumps =  2 large and 1 small pumps +  1 large and 3 small pumps =  2 large and 1 small pumps +  2 large and 1 small pumps = 2 x (2 large and 1 small pumps) Now, 2 large and 1 small pumps can fill the tank in 4 hours So, 2 x (2 large and 1 small pumps) can fill the tank = 4/2 = 2 hours

Explanation:

Which of the following inequalities is true ? Correct Answer 0.12 0<1/10<0.01 here   Right ans 0<0.01<1/10 so it is not true0.12<1/8<0.13 here Right Ans 0.12<0.125<0.13 so it is true0.30<1/4<0.50 here Right Ans 1/4 < 0.30 < 0.50 so it is not true0.30 < 1/3 <0.33 here Right Ans 0.30 < 0.33 < 1/3 so it is not true

Explanation:

Mr. Karim purchased TK. 600 worth of traveler's cheques. If each cheque was worth either TK. 20 or TK. 50, which of the following cannot be the number of TK. 20 cheques purchased ? Correct Answer 18 10*20 = 200...rest 400 is divisible by 50 15*20 = 300...rest 300 is divisible by 50 20*20 = 400...rest 200 is divisible by 50 but 18*20 = 360...rest 240 is not divisible by 50 ans 18

Explanation:

The area of a rectangle is 200 sq. meter . If the length is twice the breadth , what is the perimeter of the rectangle ? Correct Answer 60 Let L be the length and B be the breadth. So, L x B = 200 or, 2B x B = 200 or, B2 = 100 or, B = 10 So, L = 2B = 2 x 10 = 20 Therefore, the perimeter of the rectangle = 2 (L + B) = 2 (20 + 10) = 2 x 30 = 60.

Explanation:

How much interest will TK. 2000 earn at an annual rate of 10% in one year if the interest is compounded every 6 months ? Correct Answer None of these C = P(1 + r/n)nt [C = principal with interest, P = principal, r = rate of interest, n = number of times interest is compounded per time period, t = number of time periods] Here, P = 2000, r = 10% = 10/100 = 0.1, n = 2, t = 1 So, interest, I = C - P = 2000(1 + 0.1/2)2x1  - 2000 = 2000x1.052  - 2000 =  205 TK

Explanation:

A company makes a profit of 5% in its first TK. 1000 of sales each day , and 4% on all sales in excess of TK. 1000 for that day . What would be the profit of the company in day when sales are TK. 6000 ? Correct Answer 250 Profit for first 1000 TK sales = 5% of 1000 = 5/100 of 1000 = 50 TK Profit for Excess (6000 - 1000 = 5000) TK sales = 4% of 5000 = 4/100 of 5000 = 200 TK Total profit = 50 + 200 = 250 TK

Explanation:

The monthly salary of a person is increased by 10% in one month, but is decreased by 10% in the next month . What is the age of their father ? Correct Answer None of these the quesion is wrong. it should be -   The monthly salary of a person is increased by 10% in one month, but is decreased by 10% in the next month. What's the percentage change in his salary?   Solution: Let the initial salary be 100 tk. Increase by 10% will imply = 100 + 100x10/100 = (100 + 10) = 110 tk. Decrease by 10% will mean = 90% of 110 = 99 Hence the effective change is a decrease by = (100 - 99)% = 1%. (ans)

Explanation:

Average age of three brothers is 16 years . Average age of these brothers along with their father is 25 years. What is the age of their father ? Correct Answer 52 Total age of the three brothers = 3 x 16 = 48 years Total age of the brothers along with their father = 4 x 25 = 100 So, age of the father = 100 - 48 = 52 years

Explanation:

With 12.50% simple interest rate how many years are needed for a principal to get double ? Correct Answer 8 Principal with simple interest, A = P(1 + n r) or,  2P = P(1 + n x 12.5/100) or,  2P/P = 1 + n x 12.5/100  or,  n x 12.5/100 = 2 - 1 or,  n x 12.5/100 = 1 or,  n = 1 x 100 / 12.5 =  8 years

Explanation:

The compund interest at 10% per annum on a certain amount of money for two years is TK. 10.50. Then what is the principal amount in TaKa ? Correct Answer 50 C = P(1 + r/n)nt [C = principal with interest, P = principal, r = rate of interest, n = number of times interest is compounded per time period, t = number of time periods] Here, r = 10% = 10/100 = 0.1, n = 1, t = 2 Interest, I = C - P =  P(1 + r/n)nt  - P = P{(1 + r/n)nt  - 1} =  P{(1 + 0.1)1x2  - 1} = 0.21P So, 0.21P = 10.5 or, P = 10.5/0.21 = 50 TK

Explanation:

Perimeter of rectangle is 200 meter. Its width is 3/7 of its length . What is the length in meter ? Correct Answer 70 In case of a rectangle, 2(Length + Width) = perimeter or, 2(Length + 3/7 of Length) = 200 or, 10/7 of Length = 200/2 So, Length = 200/2 x 7/10 = 70 meter

Explanation:

If a number of divisible by 102, then it is also divisible by : Correct Answer 2 102 is a even number. Every even number is divisible by 2. So, easily the answer is 2.

Explanation:

If 25% of 220 equals 5.5% of w, then w is-- Correct Answer 1000 25% of 220 = 220 ×. 25 = 55 So, w = (55×100)/5.5 = 1000

Explanation:

A man's age is now 3 times his son's age. Eight years back, the man's age was 5 times his son's age. what is the present age of the son? Correct Answer 16 Let, present age of the son is x So, 3x = 5 ( x - 8) + 8 3x = 5x - 40 + 8 2x = 32 x = 16

Explanation:

If 2x - 1 =9 , then what is the value of 10x -5 ? Correct Answer 45 2x - 1 = 9 2x = 10 5× 2x = 5× 10 10x = 50 10x - 5 = 50 - 5 = 45

Explanation:

The difference between two numbers is 7 and their product is 60. One of the two numbers must be --- Correct Answer 5 Let, the smaller no be x so, the greater no is x + 7 According to question , x( x + 7) = 60 x2 + 7x - 60 = 0 x = 5, - 12

Explanation:

You deposited dolor 124 in a bank with an interest rate of 2% each year. If they offer a simple interest rate, what will be you balance after 9 years? Correct Answer 146 124 ×. 02 × 9 = 22.32 124 + 22.32 = 146.32 = 146

Explanation:

what is the next number in the series 1 , 4 , 9 , 16.......... Correct Answer 25 The series is 12, 22, 32, 42, 52, .......... n2

Explanation:

which of the following is bigger than value of 2/3? Correct Answer 16/21 2/3 = . 66 11/18 = . 61 20/36 = . 55 16/21 = . 76 29/54 = . 53

Explanation:

An item is sold for taka 65, giving the retailer a profit of 30% of the cost. What will be the new retail price if the retailer cuts his profit to 10% costs? Correct Answer 55 At 30% profit, 130 tk the retail cost is 100 tk 1 tk the retail cost is 100/130 tk 65 tk the retail cost is ( 100×65)/130 = 50 Tk At 10% out of cost profit 100 tk the sellling price is 110 tk 1 tk the selling price is 110/100 tk 50 tk the selling price is ( 110×50)/100 = 55 Tk.

Explanation:

A cake is divided into 18 pieces.If Rehana takes 1/3 of the cake and Rahim takes 1/3 of the cake left , how many pieces are left? Correct Answer 8 After Rehana takes cake is left = 18/3 = 6 (18 - 6 = 12 pieces After Rahim takes cake is keft = ( 12 - 12/3) = 8

Explanation:

The angles of triangle of a triangle are in the ratio 2 : 3: 4. the largest angle in the triangle is: Correct Answer 80 Here, 2x + 3x + 4x + = 180 x = 20 4x = 80

Explanation:

20% of 0.2 is - Correct Answer 0.04 20% of .2 = . 2 ×. 20 = 0.04

Explanation:

A person wishes to accumulate taka 150,000 by the end of 15 years by making equal half -yearly deposits over the next 15 years. If he/she earns 10% on the investment , how much must he/she deposit at the end of each half year? Correct Answer 4545.4545 x + . 10x = 150000 x = 136363.6364 Half yearly capital = x÷30 = 4545.4545

Explanation:

A restaurant meal costs taka 35.50 and there was no tax . If the tip was more than 10% and less than 15% of the cost of the meal then the total amount paid must have been between -- Correct Answer Taka 39 and taka 41 35.50 ×. 10 + 35.50 = 39.05 35.50 ×. 15 + 35.50 = 40.825

Explanation:

How much interest will taka 2,000 earn at an annual interest rate of 8% in one year if the interest is compounded every six month? Correct Answer 332.80 C = x ( 1 + r)n = 2000 ( 1 + . 08) 2 = 2332.80 interest = 2332.80 - 2000 = 332.80

Explanation:

In a school the ratio of boys to girls is 3 to 7 . If the total student is 150 then how many boys are there? Correct Answer 45 Every 10 total person has 3 boys Every 150 total person has = (3×150)/10 boys = 45 boys

Explanation:

If taka 45000 was invested in a share when the price per share was taka 90 and taka 3000 was invested when the price per share was taka 60, what was the average price per share purchased? Correct Answer 87.27 Average price = (45000 + 300o) /(500 + 50) = 87.27

Explanation:

A number consists of two digits. The sum of the digits is 9. If 63 is subtracted from the number its digits are interchanged. Find the number . Correct Answer 81 Let X and Y be the digits of decimal and unit places respectively. So, the number is 10X + Y. If 63 is subtracted from the number, it becomes 10Y + X. Now, X + Y = 9 - - - - - - - (i) Again, 10X + Y - 63 = 10Y + X or, 10X - X + Y - 10Y = 63 or, 9X - 9Y = 63 or, X - Y = 63/9 or, X - Y = 7 - - - - - - (ii) [(i) + (ii)]>>   X + Y + X - Y = 9 + 7 or, 2X = 16 or, X = 8 So, 8 + Y = 9 or, Y = 9 - 8 = 1 So, the number is 81.

Explanation:

A wheel makes 1000 revolutions in covering a distance of 88 km. The diameter of the wheel is - Correct Answer 28m A distance equal to the circumference of the wheel is covered in each revolution. So, 1000 x circumference = total distance or, 1000 x 2πr = 88000 [in meter] or,  2r = 88000 / (1000 x π ) or,  diameter = 28 m

Explanation:

One day at a school , one-twelfth of the students were absent and 20% of those present went on a field trip. If the number of students staying back at school that day was 704 , how many students are enrolled in that school ? Correct Answer 960 Let the number of students enrolled at PQR school be x x/12 students were absent So, 11x/12 students were present number of students went on a field trip = 11x/12 * 1/5 = 11x/60 Number of students who were absent or went on a field trip = x/12 + 11x/60 = 16x/60 = 4x/15 Number of students staying in the school = x - 4x/15 = 11x/15 ATQ, 11x/15 = 704 ∴x = 960 ans: 960

Explanation:

If 120% of x is equaly to 80% y, which of the following is equal to (x +y)? Correct Answer 2.5x 120% of x = 80% of y or,  y = 120/80 of x = 3/2 of x = 3x/2 Now, x + y = x + 3x/2 = 5x/2 = 2.5x

Explanation:

A mixture of 20 kg of spirit and water contains 10% water. How much water must be added to this mixture to raise the percentage of water to 25% ? Correct Answer 4 Amount of water in the mixture = 10% of 20 kg = 2 kg So, amount of spirit = 20 - 2 = 18 kg Percentage of spirit in new mixture = 100 - 25 = 75% Now, 75% of mixture = 18 kg So, 100% of mixture = 18 x 100 / 75 = 24 kg So, amount of water need to be added = 24 - 20 = 4 kg