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23 July, 17:45

A wire, 224 cm long, is cut into 3 pieces. The first is twice as long as the second. The third is one-half as long as the second. How long is the second piece?

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  1. 23 July, 17:59
    0
    First=2x

    third=x/2

    x+2x + (x/2) = 5x/2

    7x/2=224

    multiply by 2

    (7x/2) * 2=224*2

    5x=448

    x=64

    x=64 cm the second part

    first part = 2x=64*z=128 cm

    third part=x/2=64/2=32 cm
  2. 23 July, 18:03
    0
    X = 1st piece, y = 2nd piece, z = 3rd piece

    x + y + z = 224

    x = 2y

    z = 1/2y

    2y + y + 1/2y = 224

    3.5y = 224

    y = 224/3.5

    y = 64 cm< = = 2nd piece

    x = 2y

    x = 2 (64)

    x = 128 cm ... 1st piece

    z = 1/2y

    z = 1/2 (64)

    z = 64/2

    z = 32 cm ... 3rd piece
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