If there's a total of 40 students, you can divide that equally by the total amount of boy and girls. 3 girl units + 2 boy units (each unit is equivalent) is 5 total units. 40 ÷ 5 = 8 total people per unit
8 people per unit x 3 female units is 24 total females
8 people per unit x 2 male units is 16 total males
