Five friends split a $65.20 bill at a restaurant . they also each left $2.75 for the tip. how much money did each person pay in all?

You start by doing 65.20 (the bill) divided by 5 (the amount of people paying)
65.20 / 5 = 13.04 

Then you add 13.04 (how much each person paid towards the bill) and 2.75 (the amount of money each person left as a tip) 
13.04 + 2.75 = 15.79

Each person paid $15.79

If 5 people split the bill evenly, 
they would each pay
65.20/5 which equals $13.04

each person also left their own 2.75 tip

so to find out how much each individual payed, just add the two values

13.04 + 2.75 =$15.79

hope this helped