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  3. When 2/5 of a certain number is added to the number and this sum is subtracted f

When 2/5 of a certain number is added to the number and this sum is subtracted f

游客2024-01-12  17
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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