AMC12 2009 B

AMC12 2009 B · Q2

AMC12 2009 B · Q2. It mainly tests Linear equations, Rates (speed).

Paula the painter had just enough paint for 30 identically sized rooms. Unfortunately, on the way to work, three cans of paint fell off her truck, so she had only enough paint for 25 rooms. How many cans of paint did she use for the 25 rooms?

油漆工 Paula 原本有刚好够刷 $30$ 间大小相同房间的油漆。不幸的是，在去上班的路上，有三罐油漆从她的卡车上掉了下来，所以她现在只够刷 $25$ 间房。她刷这 $25$ 间房用了多少罐油漆？

(A) 10 10

(B) 12 12

(D) 18 18

(E) 25 25

Answer

Correct choice: (C)

正确答案：（C）

Solution

Losing three cans of paint corresponds to being able to paint five fewer rooms. So $\frac 35 \cdot 25 = \boxed{15}$. The answer is $\mathrm{(C)}$.

丢失三罐油漆对应于少刷五间房。所以 $\frac 35 \cdot 25 = \boxed{15}$。答案是 $\mathrm{(C)}$。

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