On Jun 16, 6:38 am, (Herb and Eneva) wrote:
I`m planning on doing a small concrete job. It will be 3 12 in. wide
by 42 in.long by 4 in. thick slabs. I would like to know how many cubic
feet are in 1 80 lb. sack of ready mix. Thanx a lot

According to this calculator http://www.quickrete.com/Calculator/Main.asp#concrete,
you would need at least 6 bags for the whole job. An 80 lb bag yields .
6 cubic feet.