In an examination 150 students secured first class in English or Mathematics. 115 students secured first class in Mathematics. How many students secured first class in English only?

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Solution

Let, No of students who secured first class in Mathematics $= n (M) = 115$
No of students who secured first class in English $= n (E)$
No of students who secured first class in English or Mathematics $= n (E \cup M) = 150$
No of students who secured first class in English only $= n (E - M)$
A.T.Q,
$n (E - M) = n (E \cup M) - n (M) = 150 - 115 = 35$

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