AMC8 1997
AMC8 1997 · Q5
AMC8 1997 · Q5. It mainly tests Divisibility & factors, Digit properties (sum of digits, divisibility tests).
There are many two-digit multiples of 7, but only two of the multiples have a digit sum of 10. The sum of these two multiples of 7 is
有许多两位数的 7 的倍数，但只有两个倍数的数字和为 10。这两个 7 的倍数的和是
(A)
119
119
(B)
126
126
(C)
140
140
(D)
175
175
(E)
189
189
Answer
Correct choice: (A)
正确答案：（A）
Solution
The two-digit multiples of 7 with digit sum 10 are 28 and 91. Their sum is 119.
数字和为 10 的两位数 7 的倍数是 28 和 91。它们的和是 119。
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