Question
Pipe ‘A’ takes 10 minutes to fill a tank.
Pipe ‘B’ takes 20 minutes to empty the same tank. If pipe ‘B’ is opened 4 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 ‘20’ litres {LCM (10, 20)} Efficiency of pipe ‘A’ = (20/10) = 2 litres/minute Efficiency of pipe ‘B’ = (20/20) = 1 litres/minute Quantity of water filled by pipe ‘A’ in 4 minutes = 4 × 2 = 8 litres Quantity of water to be filled = 20 – 8 = 12 litres Time taken by pipe ‘A’ and ‘B’ together to fill 12 litres of water = {12/(2 – 1)} = 12 minutes Total time taken = 4 + 12 = 16 minutes
14.99% of 7820 + 5535.25 ÷ 123.001 - ? = 84
? 2 + (39.99 × 10.99 + 7.01) - (39.99 × 2.99 2 + 21.99) = 21.99 × 23.01
19.22 × 11.99 + 142.15 = ?
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value....
24.75% of 20.125% of 30.05% of 2196.06 = ?Â
What approximate value will come in place of the question mark (?) in the following question?(Note: You are not expected to calculate the exact value.)<...
(15.98% of 399.99) - 6.998 = √?
83.781 `xx` 728.910 `-:` (3.008)2 = ?
Relevant for Exams:
