Question : The perimeter of a rectangle is 40 cm. If its breadth is 8 cm, then what is the difference between the length and breadth of this rectangle?
Option 1: 3 cm
Option 2: 4 cm
Option 3: 5 cm
Option 4: 6 cm
Correct Answer: 4 cm
Solution :
Use :
The perimeter of a rectangle
P = 2 (L+ B), where
L = length, B = Breadth
Breadth is 8 cm and the perimeter is 40 cm
⇒ 40 = 2L + 2(8)
⇒ 40 = 2L + 16
⇒ 2L = 24
⇒ L = $\frac{24}{2}$ = 12
⇒ Difference = L− B = 12 − 8 = 4
Hence, the correct answer is 4 cm
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