Answer:
1)20
2)55
3)35
4)math=15, English=20
5)shown above
Explanation:
1) add 15 students who like math only and 20 liked English only and 5 who did not like any subjects
15+20+5=40
subtract by total class of 60 students
60-40=20 students to like both subjects
2) add 15 students who like math only, 20 students who like English only and 20 students who like both subjects
15+20+20=55 students to like at least one subject
3) add 15 students who like math only and 20 students who like English only
15+20=35 students to like only one subject
4) as shown in Venn diagram
math=15 students, English=20 students