Question

a tank is 3/7 full of water.After removing 420 litres it became 12/35 full .how much can the tank hold when full? ​

Answer 1

4900 Litres

Explanation:

First we need a common demoninator:

3/7=15/35

Then we subtract the two to figure out how much 420 Litres is:

15/35-12/35=3/35

3/35=420 litres

Divide amount by the numerater for thow much 1/x is.

1/35=140

and multiply by the denomenator to get a full number on your fraction, and therefore a full tank.

140 x 35 = 4900