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24 February, 13:45

Dustin is mixing concrete. A formula for concrete calls for 3/8 gal of water. Dustin wants to make 7/9 more concrete than the formula creates. How much water should Dustin use? Simplify your answer.

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  1. 24 February, 13:53
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    We can use a ratio to solve this question. Lets refer to the amount formed by the formula as a serving

    1 serving needs 3/8 gal

    We want to create 7/9 servings extra, so

    1 + 7/9 = 16/7

    1 : 3/8

    16/7 : x

    1 / (3/8) = (16/7) / x

    8 / 3 = 16x / 7

    x = 7/6

    He needs to use 7/6 gallons of water.
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