Question

Makayla 在 $9$ 小时工作日中参加了两场会议。第一场会议用了 $45$ 分钟，第二场会议用时是第一场的两倍。她工作日的百分之多少用于参加会议？

Makayla attended two meetings during her $9$ -hour work day. The first meeting took $45$ minutes and the second meeting took twice as long. What percent of her work day was spent attending meetings?

$15$

$20$

$25$

$30$

$35$

答案：C

知识点：百分数单位换算

难度评级：800

解答：

两场会议用了 $45+90=135$ 分钟，而工作日共有 $9\cdot60=540$ 分钟。

用于开会的时间占全天的比例是 $\frac{135}{540}=\frac14=25\%.$

因此，正确答案是 C。

The two meetings lasted $45+90=135$ minutes, and the work day is $9\cdot60=540$ minutes.

The fraction of the day spent in meetings is $\frac{135}{540}=\frac14=25\%.$

Thus, the correct answer is C.

2010 AMC 12B 第 1 题

答案：C

难度评级：800

解答：

其他年份的第 1 题