What fraction am I?

This task is about working with simple fractions.
 
a)
One of my equivalent fractions is 12 and my denominator is 10.
 
 

What fraction am I? __________
 
 
b)
One of my equivalent fractions is 13 and my numerator is 6.
 
 

What fraction am I? __________
 
 
c)
One of my equivalent fractions is 14 and my numerator and denominator add together to make 20.
 
 

What fraction am I? __________