Question

in a school there are 20 teachers. 11 teacher teaches maths, 9 teachers teach physics 7 teachers teach chemistry,4 teaches teach maths and physics but no teachers teach both maths and Chemistry. Then how many teachers teach physics and chemistry? how many teachers teaches physics only?​

Answer 1

Step-by-step explanation:

TEACHERS TEACH PHYSICS AND CHEMISTRY

IS 9+4+7

=20 TEACHERS TEACH BOTH

P AND C.

TEACHERS TEACH ONLY PHYSICS ARE

=9+4

=13..