Lesson Logic problems - The answer to Problem 4

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The answer to Problem 4

Below (after the reminder) is the answer to the Problem 4 of the lesson Some logic problems (the topic Miscellaneous word problems
of the section Word problems in this site).

Problem 4 formulation (reminder)
There are 25 students in the class.
Each student attends a sport class or an art school. Some of students attend both the sport class and the art school.
The number of students attending the sport class is 18; the number of students attending the art school is 12.
How many of class students attend both the sport class and the art school?

Answer
The number of students attending both the sport class and the art school is equal to 5.

Back to the original lesson Some logic problems (the topic Miscellaneous word problems of the section Word problems in this site).
Go to the solution (the topic Miscellaneous word problems of the section Word problems in this site).

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