There are 10 taps connected to a tank Some of them are waste pipe and some of them are water pipe Wa...........

Quantitative Aptitude ( CCS) Pipes&cistern

There are 10 taps connected to a tank. Some of them are waste pipe and some of them are water pipe. Water pipe can fill the tank in 15 hours and waste pipe can empty the tank in 30 hours. Find the number of waste pipes if the tank is filled in 6 hours ?

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Explanation:

Answer & Explanation
Answer – 5
Explanation :
Let water pipes are x and waste pipe are Y.
x + y = 10
(x/15 – y/30)*6 = 1
Solve both equation to get x and y