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posted by Kenzay on Wednesday, April 13, 2011 at 4:17pm.
On a sunny day, a tree casts a shadow 60 feet long. At the same time, a yardstick casts a shadow 2 feet long. How tall it the tree??
Cross-multiply: Height : shadow H : 60' 3' : 2' H=3'*60'/2'= 90'
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