Question

Al 得了 algebritis，必须连续两周每天服用一粒绿色药丸和一粒粉色药丸。绿色药丸比粉色药丸贵 $\$1$ ，这两周的药丸总费用为 $\$546$ 。一粒绿色药丸多少钱？

Al gets the disease algebritis and must take one green pill and one pink pill each day for two weeks. A green pill costs $\$1$ more than a pink pill, and Al's pills cost a total of $\$546$ for the two weeks. How much does one green pill cost?

$\$7$

$\$14$

$\$19$

$\$20$

$\$39$

答案：D

知识点：方程组一次方程

难度评级：1020

解答：

共 $14$ 天，两粒药丸的每日费用为 $\frac{546}{14} = 39.$

设一粒绿色药丸价格为 $g$ 。粉色药丸价格为 $g - 1$ ，所以解得 $g = 20$ 。 $g + (g - 1) = 39,$

因此，正确答案是 D。

Over $14$ days the daily cost of the two pills is $\frac{546}{14} = 39.$

Let $g$ be the cost of a green pill. The pink pill costs $g - 1,$ so $g + (g - 1) = 39,$ giving $g = 20.$

Thus, the correct answer is D.

2003 AMC 12B 第 2 题

答案：D

难度评级：1020

解答：

其他年份的第 2 题