1. 

0.0169 x ? = 1.3
A. 10
B. 100
C. 1000
D. None of these

Answer: Option B

Explanation:

Let 0.0169 x x = 1.3.

Then, 0.0169x = (1.3)2 = 1.69

x = 1.69 = 100
0.0169