AMC8 2010
AMC8 2010 · Q7
AMC8 2010 · Q7. It mainly tests Money / coins.
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?
仅使用便士、五分币、十分币和二十五分币，弗雷迪需要最少的硬币数量，才能支付不到一美元的任意金额？
(A)
6
6
(B)
10
10
(C)
15
15
(D)
25
25
(E)
99
99
Answer
Correct choice: (B)
正确答案：（B）
Solution
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 $\boxed{4 + 1 + 2 + 3 = B(10)}$ coins.
要组成任意个位数，可以使用4个便士和1个五分币。使用3个二十五分币可以组成75美分，因此还需要2个十分币。因此，总共需要 $\boxed{4 + 1 + 2 + 3 = B(10)}$ 个硬币。
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