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AMC8 1997

AMC8 1997 · Q2

AMC8 1997 · Q2. It mainly tests Linear equations, Manipulating equations.

Ahn chooses a two-digit number, subtracts it from 200, and doubles the result. What is the largest number Ahn can get?
Ahn 选择一个两位数,从 200 中减去它,然后将结果加倍。Ahn 能得到的最大数是多少?
(A) 200 200
(B) 202 202
(C) 220 220
(D) 380 380
(E) 398 398
Answer
Correct choice: (D)
正确答案:(D)
Solution
To maximize \(2 \times (200 - n)\), minimize the two-digit \(n = 10\), so \(2 \times 190 = 380\).
要最大化 \(2 \times (200 - n)\),最小化两位数 \(n = 10\),因此 \(2 \times 190 = 380\)。
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