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10 September, 07:39

A 13.5 gallon gasoline tank is 2/3 full. How many gallons will it take to fill the tank?

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  1. 10 September, 09:42
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    Hello there!

    Let's look at all the information given to us.

    - The tank can hold 13.5 gallons

    - It is 2/3 full

    And now the question it's asking.

    - How many gallons to fill it?

    Essentially, it's asking how to make the tank 100% full when it's already 2/3 of the way full.

    To solve:

    What fraction of the tank needs to be filled up?

    100% is also equal to 3/3.

    The difference between 2/3 and 100% therefore, can be rewritten as the difference between 3/3 and 2/3. Then it's clearer that the amount the tank needs to be filled is 1/3 of it's maximum capacity.

    The maximum capacity is 13.5 gallons.

    What's 1/3 of 13.5? To get that, multiply 1/3 by 13.5, to get 4.5.

    Therefore, 4.5 is 1/3 of 13.5, and is therefore the amount of gasoline the tank needs to be filled up.

    Your answer is 4.5 gallons.
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