1620 cubic inches
There are 144 square inches in a square foot and 1.728 cubic inches in a cubic foot. So you have 7,776 square inches and that would give you 7,776 cubic inches. That would be 4.5 cubic feet.
115.5 cubic inches
A cubic yard is 46,656 cubic inches. Spread to a thicknes of 5 inches, a cubic yard of concrete covers 9332.1 square inches, which is 64.8 square feet.
doesn't work, one is square and the other is cubic
Cubic inches and square yards are two different measurements so this question cannot be answered.
The units are incompatible. Cubic measurements are for volume, square measurements are for area.
Square inches are a measure of area, like a table top. Cubic inches are a measure of volume, like in a kettle. You can't equate the one with the other.
Your answer would actually be in cubic inches, not square inches. 4x3x4=48 so 48 cubic inches.
40 square feet is 5760 square inches. 5760 square inches times 0.1 inch equals 576 cubic inches. Since there are 277.4196 cubic inches in a (US) gallon, 576 cubic inches is about 2.49 gallons.
A square foot does not contain cubic inches because it is a flat square; a cubic foot contains cubic inches in which case L x W x H gives you 1,728 cubic inches in a cubic foot. 12 x 12 x 12 = 1,728
Cubic feet is a measure of volume while square feet is a measure of area. They do not directly convert.
You cannot equate those figures