A rectangle has an area of 12 square meters, and its length is three times its width. What is the perimeter of this rectangle?

Explanation

Let the width be x meters, then the length is 3x meters. The area is length × width = 3x × x = 3x² = 12. Solving for x² gives x² = 4, so x = 2 meters. Therefore, length = 6 meters and width = 2 meters. The perimeter is 2 × (length + width) = 2 × (6 + 2) = 16 meters. Since 16 meters is not listed among the options, the correct choice is 'None of the above'.