Question

Question 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?


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Answer 1

4

Step-by-step explanation:

It is given that

Number of techers in school = 20

Number of Mathematics teachers = 12

Number of both Mathematics and Physics teacher = 4

Let's consider number of physics teacher is 'x'

So, 12+4+x=20

or 16+x=20

or 20-16=x therefore x=4

Therefore, 4 Teachers in school teaches physics.

Answer 2

Answer:

Hi❤

Step-by-step explanation:

Number of teachers who teach math or physics =n(M∪P)=20

Number of teachers who teach math = n(M)=12

Number of teachers who teach math and physics =n(M∩P)=4

Find : Number of teachers who teach physics =n(P)=?

Solution :

n(M∪P)=n(m)+n(P)−n(M∩P)

20=12+n(P)−4

20−12+4=n(P)

n(P)=12

hence 12 teacher teach the physics

Hope tanu ee help kara ga

Mainu pls brainlist mar kar do