Each week,Harry is paid x dollars per hour for the first 30 hours and 1.5x dollars for each additional hour worked that
问题描述：
Each week,Harry is paid x dollars per hour for the first 30 hours and 1.5x dollars for each additional hour worked that week.Each week,James is paid x dollars per hour for the first 40 hours and 2x dollars for each additional hour worked that week.Last week James worked a total of 41 hours.If Harry and James were paid the same amount last week,how many hours did Harry work last week?
A.35
B.36
C.37
D.38
E.39
答
according to James's working time,he totally paid 40x+2x=42x dollars for this.so Harry paid 42x.suppose H spend y hours,y>30 30x+1.5x(y-30)=42x y=38但是二样只能列出式子y=8x+30，怎么才能确定具体y的值呢？因为不知道x啊等式两边的x约掉了。y-30=8y=38