The coverage should be written somewhere on the front or back of the bag. If you are talking about ready-mix (the kind you only add water to), a bag will cover 2 sq ft at 4" depth (1' x 2' x 4").
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300 square feet (25 x 12 = 300).
A 10 X 10 area or 100 square feet.
One square yard is nine square feet, so 27 square feet is equivalent to 3 square yards. So 3 yards of concrete will cover 27 square feet.
You will need 3.5 square yards of material to cover 32 square feet.
348 square feet are 38.666667 square yards.