Ifede can use a limited number of spells to defeat trolls and goblins. It takes the same number of spells to defeat each troll, and it takes 3 spells to defeat each goblin. Let T represent the number of trolls and G represent the number of goblins that Ifede can defeat without running out of spells.

5T + 3G (less than equal to) 85

According to the inequality, how many spells does it take to defeat each troll, and what is the maximum number of spells that Ifede can use?