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Your bag should tell you how many cubic feet it makes.

1 foot = 12 inches.

15 x 12 = 180 + 5 = 185

2 x 12 = 24 + 11 = 35

7 x 12 = 84 + 6 = 90

185 x 35 x 90 = 582750 cubic inches

582750 divided by 1728 (1 square foot in inches) = 337.24 cubic feet.

Divide that by the number of cubic feet your bag of mix provides and you will know how many bags you need.

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Q: How many 80 lb bags of concrete would it take to cover a 15' 5 L x 2' 11 W x 7.5 D area?
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