Explanation:

Two pipes A & B would fill a tank in 20 & 30 minutes respectively. Both pipes being open, find when A must be turned off so that tank may be just filled in 15 minutes. Correct Answer After 10 minutes Let the time be T minutes after which pipe A need to turned off. Both of the pipes remain open together only for T minutes. Pipe A fills 1/20 of the tank in 1 minute. Pipe B fills 1/30 of the tank in 1 minute Together in 1 minute they fill (1/20 + 1/30 = 1/12) of the tank. Together in T minutes they fill = T/12 of the tank In (15 - T) minutes, pipe B alone can fill = (15 - T)/30 of the tank Now, T/12 +  (15 - T)/30 = 1 or,  {15T + 6(15 - T)}/180 = 1 or, (15T + 90 - 6T) / 180 = 1 or,  9T = 180 - 90 or,  9T = 90 So, T =  10 minutes

Explanation:

Divide Rs. 5625 among A, B & C so that A may receive 1/2 as much as B & C and B 1/4 of what A and C together receive? Correct Answer 1875, 1125, 2625 Let they receive A, B & C Rs. respectively. Now, A = (B + C) / 2 or,  2A = B + C - - - - - - - - - - (i) Again, B = (A + C) / 4 or, 4B = (A + C) or, 4B = (B + C) / 2 + C or, 4B = B/2 + C/2 + C or, 4B - B/2 = 3C/2 or, 7B/2 = 3C/2 or, B = 3C/7 - - - - - - - (ii) Now, 2A = 3C/7 + C  [from (i)] or, 2A = 10C/7 or, A = 5C/7 - - - - - - (iii) From (ii) and (iii),  B : C = 3 : 7 C : A = 7 : 5 So,  A : B : C = 5 : 3 : 7 A will receive = 5 / (5 + 3 + 7) × 5625 =  1875 Rs. B will receive = 3 / (5 + 3 + 7) × 5625 =  1125 Rs. C will receive = 7 / (5 + 3 + 7) × 5625 =  2625 Rs.

Explanation:

What percentage of profit is made by selling an article at a certain price if by selling at two third of that price there would be a loss of 20%? Correct Answer 20% Let the cost price and sell price be A and S respectively. ATQ,   (A - 2S/3) /A = 20/100 or,  (A - 2S/3) / A = 1/5 or, (A - 2S/3) = A/5 or, 2S/3 = A - A/5 or, 2S/3 = 4A/5 or, S = 4A/5 × 3/2 or, S = 6A/5 Now, profit = (S - A) / A × 100%   = (6A/5 - A) / A × 100% = (A/5) / A × 100% =  20%

Explanation:

Business partnera A, B and C agree to divide their total profit for the year in the ratios 4 : 7 : 8 respectively. If A's share of the profit is Rs. 16,000, what was the total profit of the business partners for the year? Correct Answer Rs. 76,000 Let the total profit be P. Now, A's share of profit, 4 / (4 + 7 + 8) × P = 16000 or, 4P/19 = 16000 or, P = 16000 × 19 / 4 = 76000 Rs.

Explanation:

Income of A is 25% less than B. How much percent B's income would be more than that of A? Correct Answer 33.5% Let their income be A and B respectively. Now,  A = B - 25% of B = B - B/4 = 3B/4 or,  B = 4A/3 Now,  B - A = 4A/3 - A = A/3 = A/3 × 100% = 33.33% of A

Explanation:

Nazir can wash his car 15 minutes while his son takes twice as long. If they work together how many minutes will the job take them? Correct Answer 10 His son can wash the car in (15 × 2 = 30) minutes Nazir can wash 1/15 part of the car in 1 minute His son can wash 1/30 part of the can in 1 minute Together they can wash (1/15 + 1/30 = 1/10) part of the car in 1 minute So, together they can wash the whole car in 10 minutes.

Explanation:

A glass when full of milk, weighs one kilogram. When half full, it weighs 3/4 kilogram. What is the weight of the empty glass? Correct Answer .5 kg Weight of 1/2 glass of milk = 1 - 3/4 = 1/4 kg So, weight of full glass of milk = 2 × 1/4 = 1/2 kg So, weight of the glass = 1 - 1/2 = 1/2 kg = 0.5 kg

Explanation:

If Rs. 450/- amount to Rs. 504/- in three years at simple interest, what will Rs. 650/- amount in 2 years & 6 months the interest rate being the same in both cases? Correct Answer Rs. 715/- Here, 2 year 6 months = 2.5 years Principal with simple interest, A = P( 1 + n r) Now, 504 = 450( 1 + 3 × r) or,  1 + 3r = 504/450 or, 3r = 504/450 - 1 or, 3r = (504 - 450) / 450 or, 3r = 54 / 450 or, r = 54 / (450 × 3) or, r = 1/25 Again,  A = 650( 1 + 2.5 × 1/25) or, A = 650 × (25 + 2.5)/25 or, A = 650 × 27.5 / 25 So, A = 715 Rs.

Explanation:

In a right angled triangle the horizontal side measures 8 cm and the vertical side measures 12 cm. What is the area of the triangle? Correct Answer 48 sq cm Area of triangle = 1/2 × base × height = 1/2 × 8 × 12 = 48 cm2

Explanation:

A batsman in his 17th innings makes a score of 85 and thereby increases his average by 3, his average after the 17th innings is : Correct Answer 37 Let the average of the first 16 innings be A. Total of the 16 innings = 16A New average = A + 3 New total of 17 innings, 17(A + 3) = 16A + 85 or,  17A + 51 = 16A + 85 or,  17A - 16A = 85 - 51 or, A = 34 So, new average after 17th innings = A + 3 = 34 + 3 = 37

Explanation:

A man travels 100 miles at 20 miles per hour, 60 miles at 30 miles per hour and 80 miles at 10 miles per hour, what is his average rate for the three trips? Correct Answer 16 miles per hr Time travelled at 20 miles//hr = 100/20 = 5 hrs Time travelled at 30 miles//hr = 60/30 = 2 hrs Time travelled at 10 miles//hr = 80/10 = 8 hrs Total time travelled = 5 + 2 + 8 = 15 hrs Total travelled = 100 + 60 + 80 = 240 miles Average rate = 240 / 15 = 16 miles per hour

Explanation:

A sum of Rs. 1500.00 was put in two companies, one paid 6% simple interest and the other 5%. The whole annual interest from the two companies was Rs.85.00. What is the sum invested in the first company? Correct Answer Rs. 1000 Let the investments be F and (1500 - F) Rs. in the companies respectively. Interest, I = P n r Now, F × 1 × 6/100 + (1500 - F) × 1 × 5/100 = 85 or, 6F + 7500 - 5F = 8500 [multiplying both sides by 100] or, F = 8500 - 7500 or, F = 1000 Rs.

Explanation:

A sum of 24 is divided into two parts so that seven times the first part added to five times the second part makes 146. The value of first part is? Correct Answer 13 Let the value of first and second part be F and (24 - F) respectively. Now, 7F + 5(24 - F) = 146 or, 7F + 120 - 5F = 146 or, 2F = 146 - 120 or, F = 26/2 =  13

Explanation:

How many signals can be given by 5 flags of different colours using 3 flags at a time. Correct Answer 60 Possible ways = 5P3 = 5 × 4 × 3 = 60 [Ways of choosing 3 flags from 5 flags is 5C3. But different signals can be given bay rearranging those 3 flags in 3! ways. So, total possible ways of giving signal =  5C3× 3! =  5P3]

Explanation:

What is the area of a circle with a radius of 7 meters? Correct Answer 154 sq metres Area = π R2 = 22/7 × 72 = 154 m2

Explanation:

Complete the series 1, 9, 17, 25, 33------ Correct Answer 41 1 + 8 = 9 9 + 8 = 17 17 + 8 = 25 25 + 8 = 33 33 + 8 = 41

Explanation:

Complete the series 4, 9, 17, 35,------ Correct Answer 69 4 × 2 + 1 = 9 9 × 2 - 1 = 17 17 × 2 + 1 = 35 35 × 2 - 1 = 69

Explanation:

How much would I have to pay for a book which cost Rs. 72 to produce, if the printing company sold it to a book seller at 20% profit and the bookseller sold it to me at a profit of 25%? Correct Answer Rs. 108 Book seller's buying price = 72 + 20% of 72 = 72 + 14.4 = 86.4 Rs. Book seller's selling price = 86.4 + 25% of 86.4 = 108 Rs.

Explanation:

-----is the second largest Muslim country in the world : Correct Answer Pakistan Pakistan, officially the Islamic Republic of Pakistan, is a country in South Asia. It is the world's fifth - most populous country with a population exceeding 212.2 million, and has the world's second - largest Muslim population. Pakistan is the 33rd - largest country by area, spanning 881,913 square kilometres (340,509 square miles). It has a 1,046 - kilometre (650 - mile) coastline along the Arabian Sea and Gulf of Oman in the south and is bordered by India to the east, Afghanistan to the west, Iran to the southwest, and China to the northeast. It is separated narrowly from Tajikistan by Afghanistan's Wakhan Corridor in the northwest, and also shares a maritime border with Oman.

Explanation:

If 12 years are added to 2/3 age of Rani, she will be three years older than today. What is Rani's present age? Correct Answer 27 Let the present age of Rani be R. Now, 2R/3 + 12 = R + 3 or, R - 2R/3 = 12 - 3 or, R/3 = 9 or, R = 27 years

Explanation:

----is known as the city of mosques. Correct Answer Dhaka Dhaka (formerly Dacca in English) is the capital and largest city of Bangladesh. It has been called the City of Mosques and the Venice of the East, due to its Islamic architecture and a riverfront facing the Buriganga (Old Ganges).

Explanation:

Famous Harry Potter series is written by ---- Correct Answer J. K. Rowling J.K. Rowling first had the idea for Harry Potter while delayed on a train travelling from Manchester to London King's Cross in 1990. Over the next five years, she began to plan out the seven books of the series. She wrote mostly in longhand and amassed a mountain of notes, many of which were on scraps of paper.

Explanation:

The constitution of Bangladesh was made effective on ---- Correct Answer 16-12-72 The Constitution of the People's Republic of Bangladesh is the constitutional document of Bangladesh. It was adopted on 4 November 1972 and went into effect from 16 December 1972. It provides the framework of the Bangladeshi republic with a parliamentary government, fundamental human rights and freedoms, an independent judiciary, democratic local government and a national bureaucracy.

Explanation:

Eden Gardens is a ---- Correct Answer Cricket Stadium Eden Gardens is a cricket ground in Kolkata, India. Established in 1864, it is the oldest and second - largest cricket stadium in India after the newly built Narendra Modi Stadium and third in the world after Narendra Modi Stadium and Melbourne Cricket Ground. The stadium currently has a capacity of 80,000. On 22 November 2019, the venue hosted the first ever day/night Test match in India during the second Test between India and Bangladesh.

Explanation:

Which famous black & white Indian Classic Movie is being shown in color after forty years : Correct Answer Mughal-e-Azam Mughal - e - Azam is a 1960 Indian epic historical drama film directed by K. Asif and produced by Shapoorji Pallonji. Starring Prithviraj Kapoor, Durga Khote, Madhubala and Dilip Kumar, it follows the love affair between Mughal Prince Salim (who went on to become Emperor Jahangir) and Anarkali, a court dancer. Salim's father, Emperor Akbar, disapproves of the relationship, which leads to a war between father and son.

Explanation:

Worlds tallest building is --- Correct Answer None of them The Burj Khalifa literally "Khalifa Tower" in English), known as the Burj Dubai prior to its inauguration in 2010, is a skyscraper in Dubai, United Arab Emirates. With a total height of 829.8 m (2,722 ft, just over half a mile) and a roof height (excluding antenna, but including a 244 m spire of 828 m (2,717 ft), the Burj Khalifa has been the tallest structure and building in the world since its topping out in 2009 (preceded by Taipei 101).

Explanation:

Banglalink TM is a subsidiary of ---- Correct Answer Orascom Telecom Holding Banglalink Digital Communications Ltd. eviously Orascom Telecom Bangladesh Ltd.) is the third largest cellular service provider in Bangladesh. It is fully owned by Telecom Ventures Ltd. . It is a wholly owned subsidiary of Telecom Ventures Ltd. of Malta which is owned by Global Telecom Holding.

Explanation:

Supercomputers are those which : Correct Answer Can perform billions of calculations per second A supercomputer is a computer that performs at or near the currently highest operational rate for computers. . The term is also sometimes applied to far slower (but still impressively fast) computers. The largest, most powerful supercomputers are really multiple computers that perform parallel processing.

Explanation:

The GDP Growth Rate of Bangladesh is over ---- Correct Answer 5.6 The economy of Bangladesh is a developing market economy. It's the 35th largest in the world in nominal terms, and 30th largest by purchasing power parity; it is classified among the Next Eleven emerging market middle income economies and a frontier market. In the first quarter of 2019, Bangladesh's was the world's seventh fastest growing economy with a rate of 1.3% real GDP annual growth. Dhaka and Chittagong are the principal financial centers of the country, being home to the Dhaka Stock Exchange and the Chittagong Stock Exchange.

Explanation:

"Freeze Windows Panes" is an Excel command which helps in : Correct Answer Reviewing a worksheet by holding dome columns and sliding other Freeze Panes. The Freeze Panes command gives you more options on what should be frozen on the worksheet. Instead of a single row or a single column, you can freeze one or more rows at the top, as well as one or more columns at the left.

Explanation:

What is the name given to the sequence of steps which a computer follows : Correct Answer Algorithms The CPU is the heart of the computer. A program is a sequence of instructions stored in main memory. When a program is run, the CPU fetches the instructions and executes or follows the instructions.

Explanation:

The process of identifying and correcting mistakes in a computer program is referred to as : Correct Answer Debugging Debugging is the process of detecting and removing of existing and potential errors (also called as 'bugs') in a software code that can cause it to behave unexpectedly or crash. To prevent incorrect operation of a software or system, debugging is used to find and resolve bugs or defects.

Explanation:

In a computer program, the process of executing the same instructions over is called : Correct Answer Looping প্রোগ্রামের অংশ বিশেষ নির্দিষ্ট সংখ্যক বার কোনো শর্তে না পৌছা পর্যন্ত পুনরাবৃত্তি করাকে লুপিং বলে।

Explanation:

In Ms PowerPoint, shortcut for creating a new slide is : Correct Answer Crtl + M Ctrl + M = নতুন স্লাইড যুক্ত করা। Ctrl + N = নতুন উপস্থাপনার জন্যCtrl + M = নতুন স্লাইড যুক্ত করার জন্যCtrl + O = উপস্থাপনা খোলাCtrl + P = স্লাইড প্রিন্টCtrl + R = লেখা ডান দিকে করা।

Explanation:

A network which is used for sharing data, software and hardware among several users owning microcomputers is called : Correct Answer LAN A local area network (LAN) is a computer network that interconnects computers within a limited area such as a residence, school, laboratory, university campus or office building. By contrast, a wide area network (WAN) not only covers a larger geographic distance, but also generally involves leased telecommunication circuits.

Explanation:

The computer stores its program and data in its : Correct Answer Memory Memory is the part of the computer that holds data and instructions for processing. Although closely associated with the central processing unit, memory is separate from it. Memory stores program instructions or data for only as long as the program they pertain to is in operation.

Explanation:

In Ms Word pressing CTRL + E will --- Correct Answer Centre Alignment Ctrl + E: Center text. If you want to quickly center your text, you don't have to use the alignment buttons at the top of your screen. Hit Ctrl + E and your text will be instantly centered.

Explanation:

'Microsoft Outlook' is a software designed to function as : Correct Answer A tool to receive and send emails Outlook is an e - mail software program by Microsoft that enables users to send and receive e - mail on their computer. Microsoft Outlook Express is a slimmed - down version of the Microsoft Outlook software family. ... It was first included with Windows 98 and included with all versions of Windows up to Windows XP.