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Question

8 pumps can fill a tank in 20 mins. How much time will it take to fill the tank if only 5 of them are engaged?


A
25 mins
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B
35 mins
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C
32 mins
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D
28 mins
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Solution

The correct option is B 32 mins
Given,
8 pumps can fill a tank in 20 mins.

We know that if the number of pumps is less, it will take more time to fill the tank.

So, Number of pumps(x)1Time taken(y)
x1x2 = y2y1

Given,
x1 = 8 pumps
y1 = 20 mins
x2 = 5 pumps
and y2 = time taken to fill the tankby 5 pumps
 y2 = x1 × y1x2
 y2 = 8 × 205 = 32 mins

Hence, it will take 32 mins if only 5 pumps are engaged.

Mathematics

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