You sold a total of 48$ worth of cheese. you forgot how many pounds of each type of cheese you sold. swiss cheese costs 8$ per pound. cheddar cheese costs 6$ per pound

For the Swiss cheese he sold 3 pounds of them and for the Cheddar cheese he sold 4 of them. When you multiply them together you get 24 for them both. 24+24=48. That's how you get your answer.