Question
A candidate just passed by getting 150 answers correct
by attempting 225 of the total questions. Find the total number of questions in the examination if a candidate needs 60% marks. (All questions carry equal marks)Solution
Let the total number of questions be x. then, Percentage need in exam = 60% Correct answer = 150 percentage = (correct answer)/(total questions) 
100 60 = (150/x) × 100 x = 250 Alternate method Given that 150 ≡ 60% 1 ≡ 10/25 % 250 ≡ 100% Total number of questions = 250
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