(5 x 6 x 1.5) = 45 cubic feet = (1 and 2/3) cubic yards
24 cubic feet . . . (6'x6'x 0.67')
6.2 cubic feet
That would take 250 cubic meters of sand to fill as 10*5*5 is 250.
find the area of it 320 feet squared
Assuming the box was empty to begin with there will be 8 inches of sand now.
It will take 72 sq. ft. of sand. Or 2.66 sq. yds. That will fill the box even.
24 cubic feet . . . (6'x6'x 0.67')
6.2 cubic feet
That would take 250 cubic meters of sand to fill as 10*5*5 is 250.
36 cubic feet of dirt=)
96 cubic feet
find the area of it 320 feet squared
12 sq yds
Assuming the box was empty to begin with there will be 8 inches of sand now.
1 foot by 36 sq feet = 36 cubic feet of dirt is needed
In order to answer this question you must first convert the measurements into inches(20 ft= 240 in), so the new problem is 240*240*3, which equals 172800. Then you must convert the inches into yards by dividing 172800 by 36, which equals 4800. So it takes 4800 yards of sand to fill a sandbox 20 feet by 20 feet by 3 inches.
Call around to your local lumber yards and garden supply centers to get a price on a ton of sand. In my area of Pennsylvania it was going for around $30 a ton plus delivery. This was to fill a large 5' x 5' sandbox we made under a treehouse. If you are going with a much smaller sand box you might just want to buy a few bags of sandbox sand which I have seen for $2 to $4 each depending on the size. Jim