Carol was sending out birthday invitations to 14 friends. She bought 2 packs each one having the same number of invitations. How many invitations are in each pack?
Carol is sending out birthday invitations to 14 friends. 
She bought 2 packs each one having the same number of invitations. 

We know that she bought 2 packs, and each pack has the same number of invitations. So if we can find out how many invitations are in 1 pack, we can multiply that number by 2 to find out how many invitations are in both packs. 

We also know that she is sending out a total of 14 invitations. So if we can find out how many invitations are in 1 pack, we can subtract that number from 14 to find out how many invitations are in the other pack. 

Let's call the number of invitations in 1 pack "x." 

So if we put it all together, we have: 

x + x = 14 

2x = 14 

x = 7 

There are 7 invitations in each pack.