arithmetic
posted by ibthesham .
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?

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 . . .