in an examination 80% students passed in mathematics,72% passed in science and 13% failed in both subjects.If 325 students passed in both subjects,find the total number of students who appeared in the examination.

Given: 80% students passed in Mathematics

⇒ 20% students failed in Mathematics

and 72% students passed in Science

⇒ 28% students failed in Science

also 13% failed in both

⇒ 7% failed in Mathematics only

and 15% failed in Science only

∴ Total students failed = (7 + 15 + 13) = 35 %

⇒ Total students passed in both subjects 65%