Question

Girls are one-half of the 5th grade class of 50 students. Two-Tenths of these girls have red hair. Red haired girls are what fraction of the 5th grade

Answer 1

so 25 are girls
(2/10)(25) = 5 , (why not say 1/5 of the girls are red-heads ?)

fraction you want = 5/50 = 1/10