Production lines

A productive company has 3 production lines A, B and C

respectively. It's known that:

Workers on line B also perform functions on line A.

Workers on line A do not fulfill functions on line C.

10 workers perform functions on Line B

30 workers perform functions on Line A but not on line B

25 workers do not fulfill functions in these production lines.

If it is known that

in the company there are 85 workers, what is the number of workers who perform functions in the production line

C? Justify with set theory.

Make a Venn diagram that represents the problem situation.