Gasoline tank 2

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

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You need to know the following knowledge to solve this word math problem:

algebra

equation
system of equations

numbers

fractions

Units of physical quantities

volume

Grade of the word problem

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