Question

In Joel's grade, 1⁄5 of the students have a sister. Of the students who have a sister, 5⁄6 also have a brother. What fraction of the students in Joel's grade have both a sister and a brother?

Answer 1

1/6 of the students in Joel's grade have both a sister and a brother

Explanation:

We have that:

1/5 of the students have a sister.

Of those who have a sister(1/5), 5/6 also have a brother. So

`(1)/(5)\ast(5)/(6)=(1)/(6)`

1/6 of the students in Joel's grade have both a sister and a brother