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21 May, 16:03

a contractor is mixing concrete and mixed 3 parts concrete and 9 parts water. How much water is needed for 12 parts concrete?

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  1. 21 May, 16:12
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    36 parts water

    Step-by-step explanation:

    3/9 = 1/3 = for every 1 part concrete, it's 3 parts water.

    12/x = 1/3; x = 36

    so, 12 x 3 = 36
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