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3 August, 05:28

Pi High school ordered 40 science books. The next week, the school ordered 30 algebra books. The bill for the first order was $360 greater than the bill for the second order. The two bills together total $3960. Find the price of an algebra book?

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  1. 3 August, 06:46
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    40s=360+30a

    40s+30a=$3960

    40s=360+30a

    40s/40=360+30a/40

    s = 9+3/4a

    40 (9+3/4a) + 30a=$3960

    360+30a+30a=$3960

    360+60a=$3960

    360-360+60a=$3960

    60a=$3960

    60a/60 = $3960/60

    a = $60

    The algebra book is $60
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