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math

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a man is 6ft tall and he casts a shadow of 5 ft, if a tree casts a 30ft shadow, how tall is the tree?

  • math -

    Cross multiply this ratio and solve for x.

    5/6 = 30/x

  • math -

    Ms Sue I'm still stuck

  • math -

    5/6=30/x

    You can see that 5 was multiplied by 6 to get 30. In order to keep the fraction the same, you'll also have to multiply the 6 in the denominator by 6 to get 36 as your value for x, which in this case represents the height of the tree in feet.

  • math -

    When you cross multiply, you multiply the two farthest terms for the numerator and the two closest terms for the denominator.

    5/6 = 30/x
    5x = 6 * 30
    5x = 180
    x = ?

  • math -

    X=36

  • math -

    Right. The tree is 36 feet tall.

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