Question

Out of 120 students in a class , 40 are boys . If average of boys not attending lectures is 10% and total average attendance of entire class is 80%, find the average percentage of attendance of girls

Answer 1

boys present=10%in 40 , i.e 36
total present =80% in 120 i.e 96
96-36=60
total girls r 80
60 is 75% of 80
so total girls present percentage is 75% !