Answer:
 

Step-by-step explanation: 
 we need to find the difference of fraction using number line 
Given fractions 

First we make their denominator same,
Multiply numerator and denominator of 
 by 4 and Multiply numerator and denominator of
 by 4 and Multiply numerator and denominator of 
 by 5
 by 5
 
 and
 and 

 
 and
 and 

Now, denominator are same so we can subtract easily
 

take L.C.M 20 of above expression,
 

 

we can see this in figure-1 
It can easily observe from figure that, there is 11 units difference between 4 and 15