3' means 3 feet and 24' means 24 feet.
So the square footage is
3ft x 24 ft = 72 sq.ft.,
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144
Multiply the two dimensions to get the area. The calculation will give you 12 square meters.
It is 5 feet because 2*(10+5) = 30 feet which is the perimeter
my deck
The floor of a rectangular deck has an area of 600 sq. ft. The floor is 20 ft. wide. How long is the floor?45