Question

5% of which number of 12 ?

Answer 1

if we asume 
number is a
then 
a x (5/100) =12
so number is a= 12 x 20 = 240 

Answer 2

x be the no
5/100*x=12
5x/100=12
5x=12*100
5x=1200
x=1200/5
x=240.
hope it helps frnd..