Ann had $100.She used part of her money to buy 7 ceramic cats,in which 3 of them are more expensive than the rest by $3.If she had $7 left,how much do the two types of ceramic cat cost?
人气：302 ℃ 时间：2020-03-25 20:08:01
解答
有100美元,买了七只猫,其中3只比另外4只每只贵3美元,最后剩下七美元.
如果假设四只便宜的每只x元,
令3*（x+3）+4*x=100-3
则x=12 x+3=15
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