How Many Employees?
Give this problem to your class. It is an algebra problem, but can also be solved by trial and error, depending on the experience of your students.
Half of the employees in a company went to lunch at noon. Since then 25 have returned and 7 others have gone out. At this point, there are twice as many people working as there are people out to lunch. How many people are employed at the company? (Answer: 108)