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22 May, 17:35

Q is directly proportional to r. q is 76 when r is 20. work out q when r is 45.

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  1. 22 May, 18:00
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    Q α r

    q=kr

    thus

    k=q/r

    when r=20, q=76

    hence

    k=76/20=

    q=76/20r

    when r=45 the value of q will be:

    q=76/20*45

    q=171
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