In a class of 78 students, 33.33% are girls and the remaining are boys. The average of the boys’ marks is 77 and that of average

In a class of 78 students, 33.33% are girls and the remaining are boys. The average of the boys’ marks is 77 and that of average of whole class is 65. What are the average marks of the girls?

(a) 51.5

(b) 41

(c) 43.25

(d) 53

Sol:

Boys: Girls

 52 : 26

 2 : 1

Avg marks obtain by gives = 65 – 24

= 41.