The number of 32-ounce bottles of soda Darlene would need to buy is 16 bottles of soda to serve 64 friends at 8-ounce glasses of soda per friend.
Total ounces served all friends = Servings per friend × Number of friends
= 8 ounce × 64
= 512 ounces
Number of 32-ounce bottles of soda should she buy = Total ounces served all friends / Bottle of soda
= 512 ounces / 32 ounces
= 16 bottles of soda
Therefore, the number of 32-ounce bottles of soda Darlene would need to buy is 16 bottles of soda to serve 64 friends at 8-ounce glasses of soda per friend.
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