Question

Four identical taps can fill a tank in 70 minutes. Find the time taken for 7 such taps
to fill the same tank.​

Answer 1

Answer:

given time taken for 4 identical taps = 70min

time taken for 1 tap = 70/4 = 17.5min

∴ Time taken for 7 such taps = 17.5× 7 = 122.5

min

Answer 2

Answer:

Let the time taken be x

4pipes=70min

7pipes=x

Inverse proportion

=> 4×10=7×x

4×707=x

x=40mins

7 pipes can fill in 40 mins

Answer : 40mins

here we need to keep in mind that more taps will take less time to fill a tank. So, we are not suppose to use cross multiplication method rather we have to use inverse proportion method.