Water tanks

A different amount of water is poured into each of the three identical vessels. In the first vessel, water fills 30% of its volume and in the second vessel 40% of its volume. The third container contains 19 liters of water. If we distributed the water from all the vessels equally, the water in each vessel would fill two-fifths of its volume.

What is the volume of one container?

Correct result:

x =  38 l


0.30x + 0.40x+19 = 2/5•3•x

0.30•x + 0.40•x+19 = 2/5•3•x

2.5x = 95

x = 38

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