a class of 80 is 25% girls.if 10% of the boys and 20% of the girls attended a picnic, what percent of the class attended?

Answer 1

25% of 80 is 20
so, there are 20 girls and 60 boys

10% of the boys is 6
20% of the girls is 4

so, I guess you can figure out how many attended . . .