concrete slabs

I would like to do a small concrete job. I want to pour 3 slabs that measure 12 in. wide by 42 in. long by 4 in. thick. My question is how many cubic feet are in 1 80 lb. sack of quickrete? Thanks all.
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1 80 lb bad == .6 cubic foot

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http://www.quikrete.com/ContactUs/FAQs.asp
http://www.quikrete.com/Calculator/Main.asp
Dave
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about 2/3
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