In a school there are 20 Teachers who teach Mathematics or physics. of these 12 teach mathematics and 4 teach both physics and mathematics.How many teach physics ?
Answers
Answered by
2
Answer:
The formula is_
total teacher=maths teacher +physics teacher -both teaching teacher
20=12+physics teacher -4
20-12+4=physics teacher
=12
hence no. of physics teacher is 12
hope it will help you ^_^^_^
Answered by
1
Answer:
12
Step-by-step explanation:
Given,
no. of teachers teaching maths or physics, n(M union P) = 20
no. of teachers teaching maths, n(M) = 12
no. of teachers teaching both maths and physics,n(M intersection P) =4
no. of teachers teaching physics,n(P)= x
WKT,
n(M union P) = n(M) + n(P) - n( M intersection P)
20 =12+x-4
12 + x = 20 + 4
x= 24 - 12
x = 12
therefore, no. of teachers teaching physics is 12
Hope it helps!!!
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