A 3-foot stick casts a shadow of 8 feet. If at the same time a tree casts a shadow of 15 feet, how t

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A 3-foot stick casts a shadow of 8 feet. If at the same time a tree casts a shadow of 15 feet, how tall is the tree?

Set up a proportion of height to shadow length where t is the height of a tree:
3/8 = t/15

Using our proportion calculator, we get:
t = 5.625