Let the total score of the exam be 100x Meena's before review =40% of 100x=40x. Her score after review =40x+50% of 40x=60x. Passing marks =60x+35..(1) Her score after increasing it by 20% of post revie score =60x+20% of 60x=72x Passing marks =72x−7.... (2) Equating (1) and (2) 72x−7=60x+35 ⇒x=3.5 Hence, Total Marks =100x=350 and passing marks =60x+35=245 Therefore, passing percentage =