If 55 percent of a group of people have brown hair and 80 percent of the same group do not have red hair, what fraction of those who do not have brown hair have red hair?
+128474 Let the number in the group = 100
55 have brown hair....so (100 - 55) = 45 do NOT have brown hair
And 80 do not have red hair ...so(100 - 80) = 20 DO have red hair
So
Number who have red hair 20 4
______________________________ = ____ = ___
Number who do not have brown hair 45 9
