Mathematics for IGCSE & O level - Sets (Section 1 - No. 27)
In a group of 40 students, 25 like English, 20 like Math, and 10 like both. How many students like neither English nor Math?
5
10
15
20
Spiegazione
25+20-10=35 who like E or M. Then 40-35=5 who don't.