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1 September, 01:43

the total heigh of bill mary and rob is 180 cm bob is twice as tall as bill and mary is 28 cm taller than bill how tall is rob

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  1. 1 September, 05:30
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    Rob is 76 cm tall.

    Step-by-step explanation:

    Let b = height of bill.

    Let m = height of Mary.

    Let r = height of Rob.

    "the total heigh of bill mary and rob is 180 cm"

    b + m + r = 180 Equation 1

    "bob * is twice as tall as bill"

    *I think you meant Rob is twice as tall as Bill.

    r = 2b

    "mary is 28 cm taller than bill"

    m = b + 28

    Substitue r = 2b and m = b + 28 into Equation 1.

    b + b + 28 + 2b = 180

    4b + 28 = 180

    4b = 152

    b = 38

    r = 2b

    r = 2 (38) = 76

    Rob is 76 cm tall.
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