1.  if the side of a square be increased by 4 cms. The area increased by 60 sq. cms . The side of the square is ?
A. 12 cm
B. 13 cm
C. 14cm
D. None of these

Answer: Option D

Explanation:

Let each side = x cm

Then, (x + 4 )2 - x2 = 60

⇒ x 2 + 8x + 16 - x2 = 60

∴ x = 5.5 cm