In a school there are 20 teachers who teach Mathematics or physics of these 12 the teach
Mathematics & 4 teach both physics & Mathemates
Find how many teach physics ? (this is sets chapter)
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In a school there are 20 teachers who teach Mathematics or physics of these 12 the teach
Mathematics & 4 teach both physics & Mathemates
Find how many teach physics ? (this is sets chapter)
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Answer:
4 teacher teaches
Step-by-step explanation:
20 teachers
mathematics=12 teachers
physics= 4
both teacher teaches both the subject=?=x
suppose .
Let both teacher be 2x
12-4=2x
8=2x
8/2=x
4=x
i.e x=4 (ans)
n(PuM) = 20
n(M)=12
n(PnM)=4
We know that
n(PuM)=n(P)+n(M)-n(PnM)
n(P)=n(PuM)-n(M)+n(PnM)
n(P)=20-12+4
n(P)=12