Carol was sending out birthday invitations to 2 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 2 friends. 
She bought 2 packs each one having the same number of invitations. 

That means that she bought a total of 4 invitations. 

Now we just have to divide 4 by 2 to see how many invitations are in each pack. 

4 divided by 2 equals 2. 

So there are 2 invitations in each pack.