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There are 100 student in a class 40 of them are girls. The average marks of the boys in science is 75% and that of girls is 65% find the average marks of

the class in science.


Total number of students = 100
number of girls =40
number of boys =100-40=60
average mark of boy in science =75%
let the maximum marks in science be 100
sum of total marks secured by boy 60*75=4500
average mark of girls =65%
sum of total mark secure by girl =40*65=2600
thus the average mark of class=4500+2600/100
the ans is =71%
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