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Can someone help with 21 and 22

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  • choixongdong

    21.
    company A
    $132 / 1200 = 0.11 cents per minute

    company B
    $260 / 2000 = 0.13 cents per minute

    company A is 2 cents cheaper 

    answer
    3. Company A by 2  cents per minute 

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    22.

    ratio 7:10
    so 7 + 10 = 17

    357 / 17 = 21

    boys to girls 7:10
    so
    boys = 7 x 21 = 147
    girls = 10 x 21 = 210

    asking for # of girls

    so answer is
    1.  210