题目

最好是方程的
Last summer Sam worked for a cycle dealer.The dealer agreed to pay him $210 and a new bike
for seven weeks of work.But Sam didn't enjoy the job and quit after four weeks.The dealer
gave him $21 and the bike.How much was the bike worth?
(A) $216 (B) $225 (C) $231 (D) $253 (E) None of these

提问时间：2020-12-20

答案

七周的工资是210美元加一辆自行车
四周的工资则是21美元加一辆自行车
因此,剩下三周的工资为210-21=189美元,平均每周工资为63美元
由此可知,原计划工作七周的总工资,应为63×7=441美元,减去现金210美元,就是自行车的价值231美元,选择C