Question 1208201
A cubic container was completely filled with water. When 3/5 of the water was poured into a fish tank, the tank was 1/4 full. If the capacity of the tank was 1400 cm^3 more than the container, what was the volume of the container.

let volume of container be  x

First condition
When 3/5 of the water was poured into a fish tank, the tank was 1/4 full. 

(3/5) x   = (1/4)y

y = (3/5)(4/1) x  = (12/5)x

 If the capacity of the tank was 1400 cm^3 more than the container

x= y+1400

x = (12/5)x + 1400

multiply equation by 5

5x = 12x + 7000

7x = 7000

x =1000

The volume of the container is 1000  cm^3