Your job is to deliver 100 crystal glasses to a fancy party. You will be paid $3 for each glass delivered intact, but you will forfeit $9 for every broken glass. You earned $240. How many glasses did you break?
Answer:
5...........Let G = the glasses delivered intact and B = the glasses broken.
3G - 9B = 240
G+B = 100
3(100-B) - 9B = 240
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