Math

Jean is seven years older than her brother Bob if he is three years older than their sister Mary. If the sum of their ages is 40 Siri how old is each you must set up an equation, solve and explain each step

asked by Skielar
  1. Sum is 43 not 40 sorry

    posted by Skielar
  2. J = B + 7
    B = M + 3 so J = M+3+7

    J + B + M = 43

    (M+3+7) + (M+3) + M = 43

    3 M + 13 = 43

    3 M = 30

    M = 10
    now go back and get Bob and Jean

    posted by Damon

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