Question

what is 0.04 is 1/10 of what number ?

Answer 1

`0.04= (4)/(100)\to(1)/(25) \\\\ (1)/(10) \ of \ x= (1)/(25) \\\\ (1)/(10)*x=(1)/(25) \\\\ (x)/(10)=(1)/(25) \\\\ \boxed{x=(10)/(25)\to(2)/(5)}`