AMC12 2012 B

AMC12 2012 B · Q1

AMC12 2012 B · Q1. It mainly tests Fractions, Arithmetic misc.

Each third-grade classroom at Pearl Creek Elementary has $18$ students and $2$ pet rabbits. How many more students than rabbits are there in all $4$ of the third-grade classrooms?

Pearl Creek 小学的每个三年级教室有 $18$ 名学生和 $2$ 只宠物兔子。所有 $4$ 个三年级教室中，学生比兔子多多少？

(A) 48 48

(B) 56 56

(D) 72 72

(E) 80 80

Answer

Correct choice: (C)

正确答案：（C）

Solution

Multiplying $18$ and $2$ by $4$ we get $72$ students and $8$ rabbits. We then subtract: $72 - 8 = \boxed{\textbf{(C)}\ 64}.$ In each class, there are $18-2=16$ more students than rabbits. So for all classrooms, the difference between students and rabbits is $16 \times 4 = \boxed{\textbf{(C)}\ 64}$

将 $18$ 和 $2$ 都乘以 $4$，得到 $72$ 名学生和 $8$ 只兔子。然后相减：$72 - 8 = \boxed{\textbf{(C)}\ 64}.$ 在每个班里，学生比兔子多 $18-2=16$。所以所有教室中学生与兔子的差为 $16 \times 4 = \boxed{\textbf{(C)}\ 64}$

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