The length of a rectangle is twice the breadth. If the area is 128 cm2, determine the length and the breadth. Answers:  A) b=2,l=9  B) b=8,l=16  C) b=9,l=9  D) b=4,l=14  E) b=3,l=9
We are given length l=2b and l×b=128   ∴2b×b=128   2b^2=128   b^2=64   b=±8   But breadth must be positive, therefore b=8 cm, and l=2b=16 cm.   Answer is b=8,l=16.
<result>B</result>
The length of a rectangle is twice the breadth. If the area is 128 cm2, determine the length and the breadth.