a*****g
发帖数: 1320 | 1 【 以下文字转载自 THU 讨论区 】
发信人: ashuang (不要迷恋哥，哥只是个传说), 信区: THU
标 题: one maths problem
发信站: BBS 未名空间站 (Sun Dec 5 21:56:00 2010, 美东)
My answer is different with the teacher's.
1.You are schedule to start your job at an oil change shop 2 hours after the
shop opens. Two hours after you start, a total of 11 cars have had their
oil changed since the shop opened. Three hours later, a total of 14 cars
have had their oil changed. At what rate are cars getting their oil changed
since you started working? How many cars had their oil changed before you
started work?
Thanks for any help. |
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