Question 832186
Dont forget this example i tell you...
Its helpful..

3 x 2 x 4 = 24
If we set it like ;
3 x 2 x ? = 24
6 x ? = 24 
To get the missing term, simply divide 24/6 = 4 ... 4 is the missing term. 

Chect it above.. Right?

In the prob. 
0.1 * 2/10 * ? = 0.124 (2/10=1/5= 0.2)
0.1 * 0.2 = 0.02 
So 0.124/0.02 = 6.2 is the missing term

Check:
0.1 * 0.2 * 6.2 =0.124
Answerb
B. 6.2 the third number