# 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.

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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%