AMC10 2009 B
AMC10 2009 B · Q5
AMC10 2009 B · Q5. It mainly tests Linear equations, Percent.
Twenty percent less than 60 is one-third more than what number?
60的百分之二十少于某个数的三分之一多于多少？
(A)
16
16
(B)
30
30
(C)
32
32
(D)
36
36
(E)
48
48
Answer
Correct choice: (D)
正确答案：（D）
Solution
Answer (D): Twenty percent less than 60 is $\frac{4}{5}\cdot 60 = 48$. One-third more than a number $n$ is $\frac{4}{3}n$. Therefore $\frac{4}{3}n = 48$, and the number is 36.
答案（D）：比 60 少 20% 等于 $\frac{4}{5}\cdot 60 = 48$。比一个数 $n$ 多三分之一是 $\frac{4}{3}n$。因此 $\frac{4}{3}n = 48$，这个数是 36。
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