Problem Solving MCQ Set 35

Question: The sum of 20 terms of the series 12 + 22, 32 + 42, 52 + 62 is:

1. 210
2. 519
3. 190
4. None of these.

Question: A tank is fitted with 8 pipes, some of them that fill the tank and others that are waste pipe meant to empty the tank. Each of the pipes that fill the tank can fill it in 8 hours, while each of those that empty the tank can empty it in 6 hours. If all the pipes are kept open when the tank is full, it will take exactly 6 hours for the tank to empty. How many of these are fill pipes?

1. 2
2. 4
3. 6
4. 5

Question: If A and B work together, they will complete a job in 7.5 days. However, if A works alone and completes half the job and then B takes over and completes the remaining half alone, they will be able to complete the job in 20 days. How long will B alone take to do the job if A is more efficient than B?

1. 20 days
2. 40 days
3. 30 days
4. 24 days

Question: A trader makes a profit equal to the selling price of 75 articles when he sold 100 of the articles. What % profit did he make in the transaction?

1. 33.33%
2. 75%
3. 300%
4. 150%

Question: A trader professes to sell his goods at a loss of 8% but weights 900 grams in place of a kg weight. Find his real loss or gain per cent.

1. 2% loss
2. 2.22% gain
3. 2% gain
4. None of these

Question: Rajiv sold an article for Rs.56 which cost him Rs.x. If he had gained x% on his outlay, what was his cost?

1. Rs. 40
2. Rs. 45
3. Rs. 36
4. Rs. 28