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In a school there are 20 teachers who...

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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Given,Total number of teachers`=20`
Let `A=`no of teacher teaches maths`=12`
`B=`no of teacher teaches physics`=n`
`C=`no of teacher teaches maths or physics `=4` ...
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