2. 外语
  3. When - of a certain number is subtracted from the number and then this difference is added with 20, the result is the original n

When - of a certain number is subtracted from the number and then this difference is added with 20, the result is the original n

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问题 When - of a certain number is subtracted from the number and then this difference is added with 20, the result is the original number. What is the original number?
选项 A、9
B、22
C、18
D、60
E、13
答案D
解析 假设这个数为x，根据题意得到：x-x/3+2=x，x=60，D为正确答案。
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