Question

one fourth of a tank holds 145 litres of water. what part of the tank is full if it contain 180 litres of water?

Answer 1

given
1/4 of x=145 litres
so x =580 litres.

so 180/580×100
=9/29

so
9/29 part will hold 180 litres

Answer 2

Given, 1/4 tank = 145 liters

             Full tank = 4 * 145

                            = 580 liters.

             So, 180 liters = 180/580

                                   = 9/29


Hope this helps!