Keywords: 
Roses, red roses, pink roses 
For this case we have that the grandmother has 14 red roses and 7 pink roses, you want to know how many red roses the grandmother has, more than pink roses. So: 

It is observed that 
, then there are more red roses. Subtracting we have: 

So, the grandmother has 7 red roses more than the amount of pink roses she has. 
Answer: 
It has 7 red roses more than pink