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6 October, 13:36

Book a has 24 more pages than book b. Book c has 4 times as many pages as book a. The total number of pages of pages of the three books is 180. How many pages does book b have?

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  1. 6 October, 14:10
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    A = 24 + b

    c = 4a = 4 (24 + b) = 96 + 4b

    b = b

    a + b + c = 180

    24 + b + b + 96 + 4b = 180

    Combine the variables and the whole numbers:

    120 + 6b = 180

    -120 - 120

    6b = 60

    divide on both sides by 6, and b=10

    b = 10 a = 34 c = 136, 10 + 34 + 136 = 180
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