1958 AMC 12 第 45 题
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所有题目均经美国数学协会(MAA)官方合法授权使用。
45.
一张支票的金额为 美元 美分,其中 和 都是两位数。误兑为 美元 美分,错误金额比正确金额多 。则:
A check is written for dollars and cents, and both two-digit numbers. In error it is cashed for dollars and cents, the incorrect amount exceeding the correct amount by Then:
不可能大于
cannot exceed
可以等于
can equal
支票金额不可能是 的倍数
the amount of the check cannot be a multiple of
错误金额可以等于正确金额的两倍
the incorrect amount can equal twice the correct amount
正确金额各位数字之和能被 整除
the sum of the digits of the correct amount is divisible by
小提示:
将正确金额和错误金额都写成美分
Write the correct and incorrect amounts in cents
大提示:
两者之差化简为
Their difference simplifies to
解答:
以美分计,错误金额减正确金额为 由于 等于 美分,所以 。两位数 满足此关系,并且 。因此这种相等关系可以发生。
所以正确答案为 B。
In cents, the incorrect amount minus the correct amount is Since is cents, so The two-digit values satisfy this relation and have Thus that equality can occur.
Therefore, the correct answer is B.