Let the total marks be 100x So, A scores =40% of 100x=40x And A failed by 10 marks So, Passing marks =40x+10 B scores =65% of 100x=65x And passed by 15 marks So, Passing marks =65x−15 According to the question, ⇒40x+10=65x−15 ⇒25x=25 ⇒x=1 So, Total marks =100 Passing Marks =40x+10=50 Passing %=(