Of the 5 subjects, the average marks of Rakesh in first 3 subjects was 75 and the average marks in the last 3 subjects was 82. If his marks in the third subject was 66, then what was his average marks in all the 5 subjects ?
Answer & explanation
Correct answer: option 4
Sum of marks in 1st 3 subjects = 75 x 3 = 225
Sum of marks in last 3 subjects = 82 x 3 = 246
Marks in 5 subjects = 225 + 246 - 66 = 405
Average marks in 5 subjects = 81