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8 January, 08:55

If p+q=36 and p-q=20 then q=?

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  1. 8 January, 09:21
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    Step-by-step explanation:

    using substitution method.

    p-q=20 so p=20+q Substitute into

    P+q=36

    Therefore 20+q+q = 36

    20+2q=36

    2q=36-20

    2q=16

    q = 16/2

    q=8
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