UPSC CDS Math Set Theory Questions

Let E be the set denoting the students pass in English and M be the set denoting the students pass in Mathematics.
Number of students who pass in at least one of the two subjects
=n(E∪M)=105−10=95
∴n(E∩M)=n(E)+n(M)
=n(E∪M)=80+75−95=60
Number of students who pass in only one subject