So, we have the percentage she gets which is, 90% and the number of questions she answers correctly, which is 27
To find the number of questions in the exam, make an equation (90% = = 0.9) = cross multiply and equate them 90x = 27 x 100 90x = 2700 divide by 90 on either sides to isolate x in order to find the answer 90 and 90 cancels out x = 30 So your final answer will be, there were 30 questions in the exam paper.