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21 September, 19:39

If y=12 when x=15, find x when y=21.

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  1. 21 September, 20:05
    0
    x=35

    Step-by-step explanation:

    15/12=x/21

    simplify 15/12 into 5/3,

    cross product

    5/3=x/21

    cross product

    3*x=5*21

    3x=105

    x=105/3

    x=35
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