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【OG20-P277-280题】
A certain plumber charges $92 for each job completed in 4 hours or less and $23 per hour for each job completed in more than 4 hours. If it took the plumber a total of 7 hours to complete two separate jobs, what was the total amount charged by the plumber for the jobs?
(1)The plumber charged $92 for one of the two jobs
(2)The plumber charged $138 for one of the two jobs
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设两个工作时长分别是x和y
条件1:一个未知数是小于等于4的,具体大小未知,不充分
条件2:其中一个未知数=138÷23=6,另一个是1,一共charged:138+92,充分
题目讨论 (4条评论)

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428733rqom
两个工作价格都是另算的吗…… 我以为4个小时后一起算
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0 回复 2020-11-08 11:43:50
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Stanley想去荷兰
第一份工作只要是4个小时以内都是给92元
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0 回复 2019-12-28 14:14:48
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孙大妮
不超过4小时收费92,超过4小时每小时23;条件1:一个工作收了92,工作时间不确定,因此另一个工作时间也不确定,无法求总收费,不充分;条件2:一个工作收了138,说明工作6小时,因此另一个工作时间为1小时,收费92,可求总收费,充分。
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0 回复 2018-11-25 14:30:57
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筱延汐
这道题答案是B
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0 回复 2017-12-30 13:58:28