AMC12 2003 A
AMC12 2003 A · Q5
AMC12 2003 A · Q5. It mainly tests Digit properties (sum of digits, divisibility tests), Number theory misc.
The sum of the two 5-digit numbers $AMC10$ and $AMC12$ is $123422$. What is $A+M+C$?
两个五位数 $AMC10$ 和 $AMC12$ 的和为 $123422$。求 $A+M+C$。
(A)
10
10
(B)
11
11
(C)
12
12
(D)
13
13
(E)
14
14
Answer
Correct choice: (E)
正确答案:(E)
Solution
$AMC10+AMC12=123422$
$AMC00+AMC00=123400$
$AMC+AMC=1234$
$2\cdot AMC=1234$
$AMC=\frac{1234}{2}=617$
Since $A$, $M$, and $C$ are digits, $A=6$, $M=1$, $C=7$.
Therefore, $A+M+C = 6+1+7 = \boxed{\mathrm{(E)}\ 14}$.
$AMC10+AMC12=123422$
$AMC00+AMC00=123400$
$AMC+AMC=1234$
$2\cdot AMC=1234$
$AMC=\frac{1234}{2}=617$
由于 $A$、$M$、$C$ 都是数字,所以 $A=6$,$M=1$,$C=7$。
因此,$A+M+C = 6+1+7 = \boxed{\mathrm{(E)}\ 14}$。
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