The area of a rectangle is 405 m2 and its length is 5 times its breadth. What is the perimeter of the rectangle?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 108 m
With breadth \(b\) the length is \(5b\), so area \(=5b^2\) gives \(b\); then perimeter \(=2(l+b)\).
\(5b\times b=405\), so \(b^2=81\) and \(b=9\) m
Length \(=5\times9=45\) m
Perimeter \(=2(45+9)=108\) m