Question

at a parade, 1/4 of the participants have red hair, 1/6 of them have brown hair and the rest of them have black hair. which fraction of the participants have black hair?

Answer 1

`(1)/(1)-\ all\ participants\\\\ (1)/(4)-\ participants\ with\ red\ hair\\\\ (1)/(6)-\ participants\ with\ brown\ hair\\\\ participants\ ith\ black\ hair=1-(1)/(4)-(1)/(6)\ \ \ | mu;tiply\ by\ 12\\\\ 12participants\ ith\ black\ hair=12-3-2\\\\ 12participants\ ith\ black\ hair=7\ \ \ \ | divide\ by\ 12\\\\ participants\ ith\ black\ hair=(7)/(12)`