2. 外语
  3. If the tens digit x and the units digit y of a positive integer n are reversed, the resulting integer is 9 more than n. What is

If the tens digit x and the units digit y of a positive integer n are reversed, the resulting integer is 9 more than n. What is

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问题 If the tens digit x and the units digit y of a positive integer n are reversed, the resulting integer is 9 more than n. What is y in terms of x?
选项 A、10-x
B、9-x
C、x+9
D、x-1
E、x+1
答案E
解析 正整数n的十位数是x，个位数是y，所以n=10x+y。若将n的个位和十位数字对调，所得的整数(resulting integer)为10y+x。10y+x比n多9，那么10y+x=10x+y+9，y=x+1，选择E选项。
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