The answer will depend on 4 inch slab of what material!
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That depends on the thickness of the ice. It also depends on the shape of the outline of the 1 square foot. For example ... a square with 1-ft sides can certainly support more weight than a rectangle that's 1-inch wide and 144-inches long.
12 cubic feet
a piece of yellow pine in an inside dry location can hold 1200 pounds per square inch and a 4" x 4" is really 3 1/2" X 3 1/2" or 12.25 square inches times 1200 is 16150 pounds
The 12 x 20 foot room has an area of 240 square feet, and the 15 x 15 foot room has an area of 225 square feet. That's 465 square feet of carpet. But hold the phone. Carpet is generally sold by the square yard, and a square yard is 9 square feet (as 3 feet x 3 feet is 9 square feet). The 465 square feet of floor is 51.666... or 52 square yards of carpet. It might be necessary to buy some "extra" area depending on the width of the "stock" roll of carpet from which the desired pattern/color of carpet is going to be cut.
0.212 331 gallons per foot.