Carol was sending out birthday invitations to w friends. If each package of invitations she bought had x invitations in it How many packs does she need so that no friend gets left out?
Carol is sending out birthday invitations to her friends. 

If each package of invitations she bought had x invitations in it, she would need at least y packages so that no friend gets left out. 

We can set up an equation to solve for y. 

y ≥ w/x

This equation says that y, the number of packages of invitations, must be greater than or equal to w/x, where w is the number of friends Carol has. 

For example, if Carol has 20 friends and each package of invitations has 10 invitations in it, she would need at least 2 packages of invitations so that no friend gets left out.