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a man 6.2 feet tall stands 12 feet away from a streetlight and casts a 5 ft shadow.

How tall is the streetlight?

  • algebra -

    Draw a little sketch to convince yourself that the shadow of the light is 12'+ 5'=17'

    Use proportions and cross product:
    6.2 ft : 5 ft shadow
    ? ft : 17 ft shadow

    height of light
    = 6.2*17/5
    = 21.08'

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