AMC 8 2010 Problem 7
AMC8 2010 年第 7 题
逻辑推理（跨域）★★★☆☆
Using only pennies, nickels, dimes, and quarters, what is the smallest number of coins Freddie would need so he could pay any amount of money less than a dollar?
如果仅使用便士（1 分）、五分镍币、一角硬币（10 分）和 25 分硬币，Freddie 可以用于支付少于一美元的任何金额所需的硬币的最小数量是多少？
- A.6
- B.10
- C.15
- D.25
- E.99
正确答案 · Correct Answer
B
解析 · Solution
Solution 1
To make any units digit, you can use 4 pennies and 1 nickel. Using 3 quarters, you can make 75, so you will need 2 more dimes. Therefore, you will need 4 + 1 + 2 + 3 = B(10) coins.
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