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:

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

Explanation:

ONEROUS opposite word meaning Correct Answer Easy Onerous - গুরুভার, কষ্টদায়ক। প্রদত্ত শব্দটি Adjective. easy - সহজ। প্রদত্ত শব্দটি Adjective. so, onerous এর antonym হচ্ছে easy.

Explanation:

COMIC opposite word meaning Correct Answer Tragic Comic - হাস্যকর fearful - ভয়ানক painful - যন্ত্রণাদায়ক; emotional - আবেগপ্রবণ tragic - দুঃখজনক উপরোক্ত অপশন চারটির মধ্যে Comic এর antonym হচ্ছে tragic.

Explanation:

The average age of 12 students is 20 years. If the age of one more student is included, the average decreases by 1, what is the age of the new student ? Correct Answer 7 Total age of 12 students = 12 x 20 = 240 years New average = 20 - 1 = 19 years Total age of (12 + 1 = 13) students = 13 x 19 = 247 So, age of the new student = 247 - 240 = 7 years

Explanation:

ERRATIC opposite word meaning Correct Answer Predictable Erratic - অস্থির প্রকৃতি, অনিশ্চিতগত। Dominant - কতৃৃত্বপূর্ন। Predictable - ভবিষ্যৎবাচ্য। Peaceful - শন্তিপূর্ণ। Perishable - সহজে নষ্ট হয় এমন, নশ্বর।

Explanation:

ANEMIC opposite word meaning Correct Answer Sparkling Anemic - রক্তহীন; নীরক্ত; রক্তাল্প; রক্তাল্পতাগ্রস্ত; ফেঁকাসে। Acidic - অ্যাসিডযুক্ত। Sparkling - ঝিলিমিলি। Lackluster - নিষ্প্রভ; দু্যতিহীন। Escape - নিস্কৃতি পাওয়া।

Explanation:

CORROBORATE opposite word meaning Correct Answer Deny corroborate - পূর্ব সাক্ষ্য প্রমানকে সমর্থন করে সাক্ষ্য দেওয়া। Protect - রক্ষা করা, পালন করা। Urge - অনুপ্রণিত; উত্তেজিত বা উৎসাহিত করা । Deny - অস্বীকার করা, প্রতিবাদ করা। Isolate - বিচ্ছিন্ন করা, পৃথক করে রাখা।

Explanation:

When we put on thick woolen clothing, ___ in the woolen loops that protect us from the cold. Correct Answer it is the air Finance Minister Abul Maal Abdul Muhith was the announcer of the budget of Bangladesh for fiscal year 2017 - 2018.

Explanation:

Which one of the following is equal to 1/4 of 0.01 percent ? Correct Answer 0.0025 1/4 of 0.01 % = 1/4 of 0.01/100 = 0.0025

Explanation:

A truck driver must complete a 180-mile trip in 4 hours. If his average speed is 50 miles per hour for the first 3 hours, then how fast must he travel for the final hour ? Correct Answer 30 50 × 3 = 150 180 - 150 = 30

Explanation:

Son's age is now one-third of father's age. In twelve years from now son's age will be one half of the father's age . What is the son's age in years now ? Correct Answer 12 x, 3x 2( x + 12) = 3x + 12 3x - 2x = 24 - 12 x = 12

Explanation:

A man walked 2 miles east, then 2 miles south , then again 4 miles east and finally 10 miles north. How far did he walk from the starting point ? Correct Answer 10 x2 = 62 + 82 x2 = 36 + 64 x2 = 100 x = 10

Explanation:

The ratio of boys and girls in a class is 1:2 and the class as 24 students . How many boys would have to be admitted to the class in order to make the ratio of boys to girls 1 : 1? Correct Answer 8 Boys = 24 × 1 / 1 + 2 = 8 Girls = 16 Now, ( 8 + x) ; 16 = 1 : 1 gives x = 8

Explanation:

The average of a a, b, c is 6 and a-b =4, ab = 21, What is the value of c ? Correct Answer 8 a + b + c = 6 ×3 = 18 ( a + b)2 = ( a - b) 2 + 4ab = 42 + 4 × 21 = 16 + 84 = 100 a + b = 10 10 + c = 18 c = 8

Explanation:

A book sells for TK. 65. This price gives the seller a profit of 30% on his cost. What will be the new selling price if he cuts his profit to 10% of its cost ? Correct Answer 55 At 30% profit , cost = Tk, ( 100×65)/130 = Tk.50 Now, At 10% profit , the new selling price = Tk.(110 × 50) 100 = Tk.55

Explanation:

A jar contains 10 red marbles and 30 green marbles . How many red marbles must be added to the jar so that 60% of the marbles will be red ? Correct Answer 35 New percentage of green marbles = 100% - 60% = 40% Now, 40% of total marbles = 30 [number of green marbles remains unchanged] So, total number or 100% of marbles = 30 x 100 / 40 = 75 More red marbles required = 75 - (10 + 30) = 35

Explanation:

Karim drove for h hours at a constant rate of r miles per hour . How many miles did he go during the final 20 minutes of his drive ? Correct Answer r/3 we know, Distance (D) = Speed (S) * Time (T)so, S * T = r*20/60 mins               = r / 3.(ans)

Explanation:

1 + 2 + 3 + .................. + 100 = ? Correct Answer 5050 এখানে, মোট পদ n = 100 ∴ সমষ্টি S = n(n + 1)/2 = 100(100 + 1)/2 = (100×101)/2 = 5050

Explanation:

In a class , the ratio of the number of boys to girls is 5 : 3 . What percent of the students of the class are girls ? Correct Answer 37.5% Summation of ratios = 5  + 3 = 8 So, percentage of girls = 3 / 8 x 100% = 37.5%

Explanation:

From 2004 to 2005. the sales of a book decreased by 80%. If the sales in 2006 were the same as in 2004, by what percent did they increase from 2005 to 2006 ? Correct Answer 400% let, 100 copies were sold in 2004 ∴copies sold in 2005 = 100 - 80 = 20 copies sold in 2006 = 100 so, required increase = (100 - 20)/20 × 100 = 400% (ans)

Explanation:

The average of 10 numbers is ---10. If the sum of 6 of them is 100, then what is the average of the other 4 numbers ? Correct Answer -50 Total of 10 numbers = - 10×10 = - 100 the sum of 6 numbers  is 100 so,Sum of last 4 numbers = - 100 - 100 = - 200 ∴Average = - 200/4 = - 50 (ans)

Explanation:

Karim has exactly 3 times as many Bangladesh as non-Bangladesh stamps in his collection . Which of the following cannot be the number of stamps in Karim's collection ? Correct Answer 54 Here, the ratio is 3 : 1. The total number of stamps must be divisible by the sum of the ratios which is (3 + 1 = 4). Only the number 54 is not divisible by 4. So, 54 cannot be the total number of stamps in his collection.

Explanation:

If x% of y is 10, then what is y ? Correct Answer 1000/x ATQ, x% of y = 10 or, xy/100 = 10 or, xy = 1000 or,  y = 1000/x ans: 1000/x

Explanation:

What is the are a of a square (in sq. meter) if its perimeter is 40 meter ? Correct Answer 100 Side of the square = 40 / 4 = 10 m  [ Perimeter of square = 4 x side length] So, area of the square = 102 = 100 m2

Explanation:

If the product of 4 consecutive integers is equal to one of them , then what is the largest possible value of one of the integers ? Correct Answer 3 let,4 consecutive numbers are 0,1,2,3 Now lets take the product of them: 0 * 1 * 2 * 3 = 0 As we can see, it's equal to one of the integers which is 0 So that meets the requirement. From those set of numbers, 3 is the largest. (ans)