Diesel fuel

In the morning, we refueled and set off. After the first stop, we passed 20% of diesel and 10% of the balance after the second. At the third stop, we had only 9 liters of diesel and had to refuel. How big a tank do we have?

Correct answer:

V =  12.5 l

Step-by-step explanation:

V0.20 V0.10 (V0.20 V)=9  0.72V=9  V=0.729=12.5  V=225=12.5=12.5 l

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