explanation: you have to multiply 1.25 with 4 for the drink which is 5 dollars they spent. subtract the total amount( 18.20) with the 5 dollars giving you 13.2. divide 13.2 with how many burgers they got. it says they each bought two so 4 times 2. so they got 8 burgers together. ( 13.2\ 8 = 1.65)
