6th grade

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Say you are at a bike shop. They sell tricycles, bicycles and unicycles. If there is a total of 150 wheels and 70 seats. If there are twice as many bicycles as tricycles how many of each type of bike do you have?

  • 6th grade -

    T + B + U = 70

    B = 2T

    U + 2B + 3T = 150
    -------------------
    Solve those equations simultaneously.

    2T + B = 80
    2B = 80
    B = 40
    T = B/2 = 20
    U = 70 - 40 - 20 = 10

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