Without using pennies, how many different combinations of coins (nickels, dimes, quarters) will make 30 cents?

A) 3    B) 4    C) 5   D) 6

参考答案：C

解析：只用5美分，10美分，25美分，要凑成30美分，有多少种组合。通过列举法即可，需要注意以某一种硬币为基础，进行列举。

A man once bought a fine suit for which he paid $30 more than 1/4 of its price. How much did he pay for the suit?   

A) 30    B) 4 0   C) 50   D) 60

参考答案：B

解析：一个人买了件衣服，所付的钱比衣服价格的1/4多30，求他付了多少钱？求啥设啥，设付了x，则x-1/4x=30。x=40

What is the minimum value of change that you can have in US coins (pennies nickles dimes and quarters) without being able to give someone exact change for a one-dollar bill?

A) 0.9    B) 0.99  C) 1.19   D) 1.29

参考答案：C

解析：要求用1美分、5美分、10美分、25美分，凑不成1美元的情况下，最多能有多少钱的硬币。3枚25美分，4枚10美分，4枚1美分。

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