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AMC8 1994

AMC8 1994 · Q23

AMC8 1994 · Q23. It mainly tests Arithmetic misc, Digit properties (sum of digits, divisibility tests).

If X, Y and Z are different digits, then the largest possible 3-digit sum for XXX + YX + X has the form
如果X、Y和Z是不同的数字,则XXX + YX + X的最大可能3位和的形式是
stem
(A) XXY XXY
(B) XYZ XYZ
(C) YYX YYX
(D) YYZ YYZ
(E) ZZY ZZY
Answer
Correct choice: (D)
正确答案:(D)
Solution
X max 8 (9 would carry over 4 digits). Y=9, Z=4: 888+98+8=994=YYZ.
X最大8(9会进位成4位)。Y=9, Z=4: 888+98+8=994=YYZ。
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