Answer: 35
Explanation:
Since Lori gives the cashier $50 to buy invitations and gets $8 in change, thus means that the amount spent on invitations = $50 - $8 = $42
Since he spent $42 and the invitations cost $6 for a pack of 5, the packs of invitations that he bought would be:
= ($42/$6) × 5
= 7 × 5
= 35 packs of invitation