Diesel fuel

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

Correct result:

V =  12.5 l

Solution:

 V0.20 V0.10 (V0.20 V)=9  0.72V=9  V=252=12.5=252 l=12.5 l



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