To calculate volume, all the dimensions should be converted to the same unit, so that the volume will be in cubes of that unit. Since there are 12 inches in one foot, 4 inches = 1/3 foot. Multiplying the three dimensions together yields 700/3 cubic feet of concrete required, or as a decimal, 233.33....
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400 square ft.
You will need: 12*24 = 288 square feet
There are many different sizes and designs for houses, and they do not all need the same amount of siding.
It means that you need to work much harder.
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