弱弱地问一道Prep的DS题~ 愣是想不明白~ 明天就要考试了。。555

foreverlei

At a certain company, the average (arithmetic mean) number of years of experience is 9.8 years for the male employees and 9.1 years for the female employees. What is the ratio of the number of the company's male employees to the number of the company's female employee?

(1) There are 52 male employees at the company
(2) The average number of years of experience for the company's male and female employees combined is 9.3 years.

为什么（1）not sufficient 呢

谢谢啦

foreverlei

想明白了。。哎~