The table below shows the number of employees in three clubs at a certain organization.

If there are 90 different employees in the three clubs and 10 employees arein all three clubs, how many employees are in exactly two of these three clubs?

Cricket = 60 employees

Tennis = 45 employees

Football = 25 employees

Possible answers:

A. 10

B. 15

C. 20

D. 25

E. 30

I'm completely stuck here. I recall it should be just a simple formula but can't recall that! :-/

Any help would me much appreciated, thanks!