To spread the dirt evenly between the 4 girls, divide total yards of dirt (30) by the number of girls (4).
= 30 yards ÷ 4 girls
= 30/4
simplify by 2
= 15/2
convert to mixed number
= 7 1/2 yards per girl
ANSWER: Each girl needs to spread 7 1/2 yards.
Hope this helps! :)