Answer :

Let x be the marks of candidate in thirs paper


total marks secured in all three papers = 53 + 75 + x


Total marks of three papers = 100 + 100 + 100 = 300


Percentage of marks = × 100%


= × 100%


Overall 70% of marks obtained


× 100 = 70


= 70


128 + x = 210


x = 210 – 128


x = 82


Hence, 82 marks must be secured to get overall of 70% marks


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