24 feet is 8 yards.
Assuming you're using the builder's abbreviation of yard for cubic yard (eg a 6 yd skip holds 6 cubic yds): 1 yd = 3' ⇒ 24' x 30' x 1' = (24 ÷ 3 yds) x (30 ÷ 3 yds) x (1 ÷ 3 yds) = 262/3 cu yds ≈ 26.67 cu yds So you'll need enough sand for the above volume.
24 yds - (8 yds + 2 ft) = 15 yds 1 ft
24 yds - (3 yds x 3) - (5 yds x 2) = 24 yds - 9 yds - 10 yds = 5 yds remain
Three feet in a yard. 1/3 yards in a foot.
216/(3*3) = 24 sq. yds.
18 ft = 6 yds 12 ft = 4 yds 6 yds x 4 yds = 24 yds2
6 feet and i foot
12 ft * 18 ft = 4 yds * 6 yds = 24 sq yds
162
333 yds and 1 foot
146 sq yds
9' = 3 yds