4
4 metres
4 kilometers = 4,000 meters
There are: 400 centimeters = 4 meters
4 meters = 40 decimeters
7 x 4 = 28 square meters.
There are 5 times 4 = 20 square meters
4 feet = 1.2192 meters
4*5 = 20 square meters
6,437.376 meters.
That would be 4. Now, what did you actually mean to ask?
12