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【OG20-P147-9题】
While a family was away on vacation, they paid a neighborhood boy $11 per week to mow their lawn and $4 per day to feed and walk their dog. If the family was away for exactly 3 weeks ,how much did they pay the boy for his services ?
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(11+4*7)*3=39*3=117
206030zwiis
three weeks is 21days thus3*7*4=84 84+·……
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2019-09-25 21:25:14
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