A rathole mine operating illegally was flooded by water from the adjacent Lyteinriver in Meghalaya T...........

Quantitative Aptitude ( CCS) Pipes&cistern

A rathole mine operating illegally was flooded by water from the adjacent Lyteinriver in Meghalaya. To rescue people trapped inside the mine, pumping out of water is necessary. If 15 pumps of equal capacity can pump out all of the water from the rat hole mine in 7 days, then how many extra pumps will be required to pump out all of the water from the rat hole mine in 5 days?

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Explanation:

15 pumps of equal capacity can pump out all of the water from a rat hole mine in Meghalaya in 7 days.
In order to pump out all of the water from a rat hole mine in one day, it will take 15 * 7 = 105 days.
Hence, in order to pump out all of the water from a rat hole in 5 days, it takes = 105/5 = 21 pumps.
Extra pumps = 21-16 = 5.