Question

In a school there are 20 teachers who teach Mathematics or Physics.Of these, 12 teach Mathematics and 4 teach both Mathematics and Physics. How many teach only Physics?​

Answer 1

Answer:

4

Step-by-step explanation:

Let the number of teachers who teach only Physics be x.

Total no. of teachers who teach Mathematics or Physics= 20

12+4=16

16+x= 20

x= 20-16

x=4