Question
Pipe ‘A’ takes 20 minutes to fill a tank. Pipe
‘B’ takes 35 minutes to empty the same tank. If pipe ‘B’ is opened 17 minutes after pipe ‘A’, then find the total time taken to fill the tank in this manner.Solution
Let the capacity of the tank be ‘140’ litres {LCM (20, 35)} Efficiency of pipe ‘A’ = (140/20) = 7 litres/minute Efficiency of pipe ‘B’ = (140/35) = 4 litres/minute Quantity of water filled by pipe ‘A’ in 17 minutes = 17 × 7 = 119 litres Quantity of water to be filled = 140 – 119 = 21 litres Time taken by pipe ‘A’ and ‘B’ together to fill 21 litres of water = {21/(7 – 4)} = 7 minutes Total time taken = 17 + 7 = 24 minutes
The difference between the value of the number increased by 10% and the value of the number decreased by 20% is 72. Find the number.
- Income of 'M' is 30% more than that of 'N'. 'M' and 'N' save 50% and 40% of their respective incomes. If their expenditure difference is Rs. 600, what is t...
A sum of Rs. 36,800 was divided between 'A' and 'B' such that the amount received by 'B' was 30% more than that by 'A'. If 'A' and 'B' spent 10% and 25...
A girl spent 32% of her monthly income on clothing. Of the remaining, she spent on travel and food in the ratio of 5:3. If the difference of the income ...
In a job fair, 50% of the people are graduates, one fifth of them are post graduates and rest are double graduates. If three-fourth of the graduates, 60...
"Aman scored 220 marks and missed the passing mark by 44 marks. If Priya secured 330 marks, then by what percentage are Priya's m...
If the price of an essential good rises by 18% and the consumer decreases his consumption by 12%, what will be the percentage change in the expenditure?
The respective ratio of monthly income of A to monthly income of B is 5:6, and A’s saving is (100/6)% more than B’s saving. Find the expenditure of ...
A and B both spend 30% of their income together which is equal to Rs 26400. If income of A is 20% more than that of B, then find the income of B (in Rs)?
A student multiplied a number by 3/5 instead of 5/3, What is the percentage error in the calculation ?
...
Relevant for Exams:
