The perimeter and length of a rectangle are in the ratio of 8 : 1, and the area of the rectangle is 1323 cm2. Find the length of the rectangle.
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Correct answer: B
Explanation
The correct answer is option 2 i.e 21 cm
The perimeter of rectangle = 2(l + b)
⇒ Perimeter of rectangle / Length = 8
⇒ 2(l + b) / l = 8
⇒ b = 3l
The area of rectangle = lb
⇒ lb = 1323
⇒ 3l2 = 1323
⇒ l2 = 441
⇒ l = 21 cm