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Let the total number of questions be x. then, Percentage need in exam = 40% Correct answer = 100 percentage = (correct answer)/(total questions) 100 40 =
100 x = 250 Alternate method Given that 100 ≡ 40% 1 ≡
% 250 ≡ 100%
total number of questions = 250
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The LCM and the HCF of the numbers 30 and 45 are in the ratio:
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