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
(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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