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2015-04-24T22:01:33+05:30

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let the height of the tree = x
3/5 * x = 9
    x = 15
now, height of the tree = 15 
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2015-04-24T22:01:57+05:30

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Let the height of the tree = H meters

The part of the tree that is visible = 2/5 * H

the part which is hidden by the building = H - 2/5 * H = H * [ 1 - 2/5 ]
           = 3/5 * H

the part hidden of the tree = the height of the building
         3/5 * H = 9 meters
               H = 9 * 5 / 3 = 15 meters

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