Water tanks

A different amount of water is poured into the three identical vessels. Water fills 30% of its volume in the first vessel, 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 answer:

x =  38 l

Step-by-step explanation:

0.30x + 0.40x+19 = 2/5·3·x

0.30·x + 0.40·x+19 = 2/5·3·x

2.5x = 95

x = 95/2.5 = 38

x = 38

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