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Let the total number of questions be x. then, Percentage need in exam = 40% Correct answer = 60 percentage = (correct answer)/(total questions) x 100 40 = (60/x) x 100 x = 150 Alternate method Given that 60 ≡ 40% 1 ≡ 
% 150 ≡ 100% Therefore, Total number of questions = 150
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