Answer:
18 cups of water
Explanation:
According to the directions, 1 pound of cement requires 5 cups of water. This is our conversion factor. We can find the cups of water required for 3.5 pounds of cement using proportions.
3.5 pound of cement × (5 cups of water / 1 pound of cement) = 17.5 cups of water ≈ 18 cups of water (rounding off to two significant figures)