Question

What should come in place of x in the following equation?

x128 = 162x
A) 13
B) 12
C) 17
D) 16

Answer 1

Answer:   D) 26.88 

Explanation:

Given series follows the rule of

1050/2.5 = 420
420/2.5 = 168
168/2.5 = 67.2
so 67.2/2.5 = 26.88

Answer 2

What should come in place of x in the following equation?

x128 = 162x
A) 13
B) 12
C) 17
D) 16

Answer: B) 12

Read Description:

Let x/√128 = √162/x

Then, x^2 = √128 × 162

= √64 × 2 × 18 × 9

= √8^2 × 6^2 × 3^2

= 8 × 6 × 3

= 144

Hence, x = √144 = 12