Out of a group of 20 teachers in a school, 10 teach Mathematics, 9 teach Physics and 7 teach chemistry. 4 teach Mathematics and physics but none teach both Mathematics and chemistry. How many teach chemistry and physics? How many teach only physics?
Answers
Answered by
5
Answer :
7 teachers teach chemistry and 9 teachers teach physics. (in total)
As 4 teachers teach both physics and mathematics so,
9-4=5
Hence 5 teachers teach only physics.
Answered by
5
Answer:
10 teaches maths; 4 teaches maths n physics
only physics teacher = 5 and remaining 6 teaches maths.given,
7 teaches chemistry.
therefore, teachers engaged in teaching physics + chemistry = 5+7=12
again,given total teachers = 20 teachers engaged in phy chemistry and maths=6+5+7= 18
therefore 20 - 18 = 2 teachers r teaching both physic n chemistry
( 5 - 2 ) 3 teachers are teaching only physics
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