How much water 80 lb of concrete mix?

To determine the amount of water needed for 80 pounds of concrete mix, you typically use a water-to-cement ratio. A common ratio is 0.5, meaning for every 100 pounds of concrete mix, you would use about 50 pounds (or approximately 6 gallons) of water. For 80 pounds of concrete mix, you would need around 4 pounds of water, or about 0.5 gallons. However, it's essential to check the specific instructions on the concrete mix packaging, as different mixes may have varying requirements.