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The difference betweem the digits' in a two-digit numeral is 3. The units' digit is twice the tens' digit. Find the numeral.

In one day, Sheila received 13 packages. Federal Express delivered three times as many as Airborne Express, while U.S. delivered two fewer than Airborne Express. How many packages did each service deliver to Sheila?

A square window is framed by two rectangular wooden shutters. Each shutter is as long as one side of the window and its width is 18 inches less than its length. If the area covered by one of the shutters is 594 square inches less than the area covered by the window,...