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  Number and Math Play

Time to Paint the Floor
Q If it takes Polly the Painter 1 hour to paint a bedroom floor that is 9 feet wide and 12 feet long, how long will it take her to paint the living room floor, which is twice as wide and twice as long?

A Four hours. The size of a room that measures 9? x 12? is 108 square feet. A room that is twice as long and twice as wide will measure 18? by 24?, which makes 432 square feet. That makes the living room 4 times the size of the bedroom, so it will take 4 times as long to paint.

Source: Number and Math Play original