A post 6 meters high casts a shadow 4 meters long. What is the height of a nearby tree that casts a shadow 28 meters long?

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The ratio of the height of the pole to its shadow is 6/4=3/2 or 3:2.

The same ratio applies to the tree of height h: h/28=3/2, so h=28(3/2)=42m.

 

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