Final answer:
When Camden decides to buy 5 drinks, he can buy a maximum of 14 candies.
Step-by-step explanation:
Let's determine the maximum number of candies Camden can buy when he decides to buy 5 drinks.
The total cost of 5 drinks is 5 x $6 = $30.
Camden has $80 to spend, so he has $80 - $30 = $50 remaining to buy candies.
Since candies cost $3.50 each, the maximum number of candies he can buy is $50 / $3.50 = 14.29.
However, he must buy at least 15 drinks and candies altogether, so he cannot buy 14 and a fraction of candies.