john poured 2 1 / 2 liters of water into a tank. then he poured out 3 2 / 5 liters of water from the tank , leaving 4 1 over 5 liters of water in the tank how much water was in the tank at first?

Answer 1

4 1 over 5 = 4 1/5?

Let x = amount in tank at first

x + 2.5 - 3.4 = 4.2

Solve for x.