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