Mathematics for IGCSE & O level - Sets (Section 3 - No. 42)
In a class of 50 students, 30 play football, 25 play basketball, and 10 play both. How many students play only football?
10
15
20
30
Εξήγηση
10 students play both football and basketball, so only 30-10 = 20 play only football.