Let us analyze this question using graphics.

We know that there are 70% women and 30% men in a company:

60% of all employees are married (some of them are women and some are men):

There are 30% of the men in a company overall so if 2/3 of the men are single then 20% of employees in a company are single men. Obviously, 10% of employees in a company are married men:

Considering that overall 60% of employees are married we now know that 50% of employees are married women:

Since women are 70% of employees and married women are 50% of employees we can easily find what fraction of the women are married:

50% / 70% = 5/7.