1. 

What should come in place of both x in the equation :

x = 162
128 x


A. 12
B. 14
C. 144
D. 196

Answer: Option A

Explanation:

Let x = 162
128 x

Then x2 = 128 x 162

   = 64 x 2 x 18 x 9

   = 82 x 62 x 32

   = 8 x 6 x 3

   = 144.

x = 144 = 12.