Abox of dried fruit has 60 calories in 5 servings. how many calories are there per serving?

Hi my sisters and brothers can tell me the answer because i don’t understand the question

The sum of two numbers is 86, and their difference is 20. find the two numbers

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?