Out of 120 students who secured Ist class marks in Maths or in English, 75 students obtained Ist class in Maths and 15 in English. How many got Ist class marks in English only?

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Out of 120 students who secured Ist class marks in Maths or in English, 75 students obtained Ist class in Maths and 15 in English and mathematics. How many got Ist class marks in English only

As we know that, nME=nM+nE-nME120=75+ nE-15 nE=60So, nE-M= nE-nME=45

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