A tank was filled with water. After 600ml of water was poured out, the tank was 5/8 full. How much water was in the tank at the end?(express your answer in litre)
Call the amount in the full tank = A ....so...
A - 600 = (5/8)A rearrange
(3/8)A = 600 multiply both sides by (8/3)
A = 1600ml ....so (1600 - 600)ml = 1000ml = 1L
+414 
