Question

There are 3 fourth grade clases with a total of 90 scholars. 2/5 of the scholars have a sister. 1/2 of the scholars have a brother. How many scholars have a sisters?​

Answer 1

There are 36 scholars who have a sister.

Explanation:

Given that:

Total number of scholars in classes = 90

Fraction of scholars who have a sister = 2/5

Fraction of scholars who have a brother = 1/2

Number of scholars who have sisters = 2/5 of 90

Number of scholars who have sisters =
`(2)/(5)*90`

Number of scholars who have sisters = 36

Hence,

There are 36 scholars who have a sisters.