Question
A candidate just passed by getting 25 answers correct by
attempting 60 of the total questions. Find the total number of questions in the examination if a candidate needs 20% marks. (All questions carry equal marks)Solution
Let the total number of questions be x. then, Percentage need in exam = 20% Correct answer = 25 percentage = (correct answer)/(total questions) 
100 20 = 100 x = 125 Alternate method Given that 25 ≡ 20% 1 ≡ % 125 ≡ 100% total number of questions = 125
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