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Maths Pri 5

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The number of S's stamps is 30% of D's stamps. The number of D's stamps is 40% of B's stamps. If they have 608 stamps, how many stamps does D have?
(i need a model method to answer this)

  • Maths Pri 5 - ,

    s = .3 d
    d = .4 b so s = .12 b

    s + d + b = 608

    .12 b + .4 b + b = 608

    1.52 b = 608
    b = 400
    d = .4 b = 160

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