The total amount of hamburger that the manager of the store in the morning = 35.75 pounds Quantity of hamburger sold to one customer during the day = 15.4 pounds Quantity of hamburger sold to another customer during the day = 13.22 pounds Total quantity of hamburger sold by the manager during the day = (15.4 + 13.22) pounds = 28.62 pounds Then The quantity of hamburger left in the store to sell = (35.75 - 28.62) pounds = 7.13 pounds So 7.13 pounds of hamburger is still left to be sold.