Question

In Scarlett's grade, 1/5 of the students have a sister. Of the students who have a sister, 1/4 also have a brother. What fraction of the students in Scarlett's grade have both a sister and a brother?

Answer 1

1/20

Explanation:

In Scarlette grade 1/5 of the students have a sister.

Of the students who have a sister 1/4 also have a brother

Therefore fraction if students in Scarlet's grade who had both brothers and sister can be calculated as follows

= 1/5 ×1/4

= 1/20