Question

four pipes can fill a tank in 70 minutes. how long will take to fill the tank if 7 pipes are used ?
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Answer 1

Answer:

Let 7 pipes take x minutes to fill the tank

In 70mins a tank is filled by 4pipes

In 1 mins a tank is filled by 70×4

In x mins a tank will be filled by

7

70×4

=40mins

Hence, the tank will be filled in 40 minutes.

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Answer 2

ANSWER

First divide 70÷4 then you will get 17.5

Then multiply it with 7

You will get the answer as 122.5