Question

In a school, there are 20 teachers who teach maths or physics. of these12 teach maths and 4 teach both of them. how many taught maths and physics

Answer 1

Answer:

20 teachers who teach math(M) ,or Physics(P) = n(M∪P) =20

n(M)=12

n(M∩P) =4

n(P) = ?

n(P) = n(M∪P)+n(M∩P)-n(M)

=20+4-12

=24-12

=12

12 teach physics

Step-by-step explanation:

Answer 2

20 teachers who teach math(M) ,or Physics(P) = n(M∪P) =20

n(M)=12

n(M∩P) =4

n(P) = ?

n(P) = n(M∪P)+n(M∩P)-n(M)

=20+4-12

=24-12

=12

12 teach physics