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A 20 foot ladder is leaning against a building.if the ratio of the base of ladder's distance from the building to its top's height from the ground is 3:4,find how high the top of the ladder is from the ground.

  • maths -

    since ratio of the two other sides is 3:4
    let their lengths be 3x and 4x

    (3x)^2 + (4x)^2 = 20^2
    9x^2 + 16x^2 = 400
    x^2 = 16
    x = 4

    so the two sides are ......
    and .....

    take if from above.

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