A flag pole is 20 feet tall, it's shadow is13 feet long. A boy is standing next to the flag pole. He is 5.5 feet tall about how long is his shadow?

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You cross multiply the ratio of 13ft (shadow) over 20ft (flag pole) by x (shadow for boy) over 5.5ft (BOY) and then divide the products 71.5/20 = 3.575ft and I'd round that to 3.6ft for less sig figures