Respuesta :

We have an equation: 0.04/? = 1/10

Cross multiply:
1*? = 0.04*10
⇒ ? = 0.04*10/1= 0.4

0.04 is 1/10 of 0.4~
0.04 is 1/10 of 0.4 
All you do is multiply 0.04 to 10.