"Square feet" aren't things that are used to cover area."35 square feet" is an amount of area that you have to cover with something.
It would be square feet which is a measure of area.
You can't convert meters to square meters.
It would take roughly 66 bags to cover a 200 square ft area 2 inches thick
You would need 25 (5x5).
about 10.5 square feet
32.3 square feet.
Wow, really? divide by three (because there are three feet in a yard) and: the area is three square yards.
Three bundles in a square, a square is 100 square feet of coverage, or a 10 foot by 10 foot area. 9 bundles is 3 square, 300 square feet.
Each bag will cover about 16 metres square.