A rectangle has a length that is four times its width. If the perimeter is 100 cm, what is the area of the rectangle?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 400 cm2.
Let width = w, and Length = 4w
Perimeter = 2(4w + w) = 10w = 100
⇒ w = 100/10 = 10 cm
Length = 4 × 10 = 40 cm
Area = 40 × 10 = 400 cm2