Which are working, that don’t have families and that are singing in the shower?

In the youth summer village there are 150 people, 75 of them are not working, 50 of them have families and 100 of them like to sing in the shower. What is the largest possible number of people in the village, which are working, that don’t have families and that are singing in the shower?
A. 25.
B. 50.
C. 75.
D. 100.
E. 150.

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