3/4 of a family wear glasses.of those who do not wear glasses 1/3 are male what fraction of the family are females who do not wear glasses

Question

what are the answer

Answer 1

Use a tree diagram

 

3/4 wear glasses        1/4 no glasses 

                                     |     |

                                     |     |

                           1/3 male    2/3 female

 

 

so (1/4)(2/3) = 2/12 are females that do not wear glasses or 1/6 of the family are females that do not wear glasses.