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【OG20-P174-179题】
In order to complete a reading assignment on time, Terry planned to read 90 pages per day. However, she read only 75 pages per day at first, leaving 690 pages to be read during the last 6 days before the assignment was to be completed. How many days in all did Terry have to complete the assignment on time?
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Terry: plan 90p/d
Real 75p/d
Left 690 在离完成期限只有6天的时候;用了多少天,才能准时完成这本书
设一共需要x天
90x就是数的总页数
75*(x-6)+690=90x
X=16
题目讨论 (3条评论)

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Elaine750
理清数量关系
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0 回复 2019-11-03 15:00:06
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Mak
最后6天按原计划是每天90页,即最后六天本来应该读6*90=540页。 实际上读了690页,多出150页,就说明一开始那段时间一共少读了150页 而一开始的那段时间实际比计划每天少读15页 150/15=10 10+6=16天
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0 回复 2018-11-29 08:56:12
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棋王回复Mak
嘿嘿对的,我跟你思路一样
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0 回复 2019-06-28 15:57:02
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黑猫警长回复Mak
我也是这个思路
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0 回复 2019-07-09 19:36:13
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CX
已经用了X天读7页每天 75X➕690=90(X➕6)
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0 回复 2017-12-08 16:18:07
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默默回复CX
列出一个一元一次方程
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0 回复 2018-04-21 05:19:15
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