马上就考了，Prep 数学题请教3，牛牛！感谢

Are at least 10 percent of the people in country x who are 60 years old or older employed?

(1)   in country x, 11.3 percent of the population is 65 years old or older

(2)   in country x, of the population 65 years old or older, 20 percent of the men and 10 percent of the women are employed.

答案：B

大牛啊，像这中at least的题，一般都是什么思路才可以做出来啊？