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When 2/5 of a certain number is added to the number and this sum is subtracted from 108, the result is the original number. What
When 2/5 of a certain number is added to the number and this sum is subtracted from 108, the result is the original number. What
admin
2009-05-19
76
问题
When 2/5 of a certain number is added to the number and this sum is subtracted from 108, the result is the original number. What is the original number?
选项
A、35
B、45
C、54
D、135/2
E、270
答案
B
解析
108减去某数与其2/5的和等于该数,问这个数是多少?
解:本题的正确答案为(B)。设该数为x,则由题意可得:108-(1+2/5)x=x so, x=45
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