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If the sides of a square are decreased by 3 cm, the area is decreased by 81 cm^2. What were the dimensions of the original square?

If one-half a number is subtracted from five-sixths of the number, the difference is 6. Find the number.

The local donut shop sells donut holes in boxes of 20, 45, and 60. You have $10 of spending money that must last until Friday. How many boxes of each size should you but to make sure that everyone has enough to eat, while at the same time minimizing the cost? Known...