1. In a company of 50 employees, are three standing committees: finance, program and planning. There are 25 members of finance, 18 in program and 20 in planning. Also 10 are in both finance and program. 11 are in both program and planning, 5 are with finance too, and 12 are with finance and planning:
Note: The exercise, as posted, is poorly phrased. I am fairly certain that the previous reply is making the assumption that the exercise statement is meant to express the following:
"A company with 50 employees has three standing committees, being finance, program, and planning. The finance committee has 25 members; program has 18 members; planning has 20. Ten employees are on both the finance and program committees; 11 are on both the program and planning committees, with 5 of these being also on the finance committee; and 12 employees are on the finance and planning committees."
I would make the same assumption about the meaning, but you might want to state in your homework that this is the assumption that you are making, just in case.