# Vehicle tank

A vehicle tank was 3/5 full of petrol. When 21 liters of fuel was added it was 5/6 full. How many liters of petrol can the tank hold?

Correct result:

V =  90 l

#### Solution:

3/5•V + 21 = 5/6•V

7V = 630

V = 90

Our simple equation calculator calculates it.

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