tolong kerjakan no.3 pake cara ya...

a/b = 50.
a/2b = 25.

Karena 100/2 = 50
dan 100/2(2) = 100/4 = 25.

[tex] \frac{a}{b} [/tex]=50
a=50
b=1
[tex] \frac{a}{2b} [/tex]= b.2 
=50/2=25
jawab=A.25