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Without knowing the size of the bag you haven't given us enough info to answer the question.
That depends on how DEEP you want the concrete !
2016.67 yards! better get you some help!!! lol
about 17 yards of concrete (it's sold by the cubic yard)
how to get 1600 mulch which is money in bin weevils
three
1 yard of mulch at 12 inches deep would cover 25 sq. ft., so for 400 square feet you would need 16 yards. 12 inches is the depth you need to start with because the mulch will settle.
Half a cubic foot.
That's 13 cubic yards of mulch for every 2 inches deep.
1 cubic yard will cover 15 square yards at 3 inches deep.
For 1 foot deep, 400 cu ft. For 3 inches deep, 100 cu ft.
One cubic yard of mulch will cover approximately 160 square feet at 2" deep, so you would need approximately two cubic yards of mulch to cover 271 square feet at 2" deep.
It depends how deep you want it.
25 cubic feet or about 1 cubic yard.
33.33 cu yds
Without knowing the size of the bag you haven't given us enough info to answer the question.