问题
单项选择题
A cashier mentally reversed the digits of one customer’s correct amount of change and thus gave the customer art incorrect amount of change. If the cash register contained 45 cents more than it should have as a result of this error, which of the following could have been the correct amount of change in cents ？（）
A．14
B．45
C．54
D．65
E．83
答案
参考答案：E
解析：
设正确零钱的十位数为m，个位数为n，根据两个数字颠倒了以至于多了45美分可得：
(10m+n)-(10n+m)=45
m-n=5
即十位数减个位数的值应为5，在五个选项中只有(E)选项的83满足条件。