1997 AMC 8 Problem 2

Attempt Problem 2 of the 1997 AMC 8 below, then check your answer against the professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 1997 AMC 8 solutions, or check the answer key.

All problems are used with official legal permission of the Mathematical Association of America (MAA).

2.

Ahn chooses a two-digit integer, subtracts it from 200,200, and doubles the result. What is the largest number Ahn can get?
200200
202202
220220
380380
398398
Answer: D
Concepts:optimization
Small hint:
The smallest two-digit integer is 1010
Big hint:
To maximize the result, subtract the smallest possible two-digit number
Solution:
To get the largest number, we would want to subtract the smallest number possible from 200.200.
The smallest two-digit number is 10.10. Having Ahn choose this number will give us 2(200−10)=2⋅190=380 2 (200 - 10) = 2 \cdot 190 = 380 as the final result.
Thus, D is the correct answer.
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