Gasoline tank 2

A gasoline tank is 1/6 full. When 25 liters of gasoline were added, it became 3/4 full. How many liters are more needed to fill them? Show your solution.

Correct result:

x =  10.7143 l

Solution:


V/6 + 25 = 3/4•V
x = V - 3/4•V

7V = 300
V-4x = 0

V = 300/7 ≈ 42.857143
x = 75/7 ≈ 10.714286

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