AMC8 2003

AMC8 2003 · Q4

AMC8 2003 · Q4. It mainly tests Linear equations, Systems of equations.

A group of children riding on bicycles and tricycles rode past Billy Bob’s house. Billy Bob counted 7 children and 19 wheels. How many tricycles were there?

一群孩子骑着自行车和三轮车经过Billy Bob的房子。Billy Bob数到7个孩子和19个轮子。有多少辆三轮车？

(A) 2 2

(B) 4 4

(D) 6 6

(E) 7 7

Answer

Correct choice: (C)

正确答案：（C）

Solution

(C) The following chart shows that the answer must be 5 tricycles. \[ \begin{array}{ccc} \text{Bicycles} & \text{Tricycles} & \text{Wheels} \\ 0 & 7 & 21 \\ 1 & 6 & 20 \\ 2 & 5 & 19 \\ 3 & 4 & 18 \\ \end{array} \]

（C）下表显示答案必须是 5 辆三轮车。 \[ \begin{array}{ccc} \text{自行车} & \text{三轮车} & \text{车轮数} \\ 0 & 7 & 21 \\ 1 & 6 & 20 \\ 2 & 5 & 19 \\ 3 & 4 & 18 \\ \end{array} \]

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