During the day, the manager of the meat department sold 15.4 pounds of hamburger to one customer and 13.22 pounds to another customer. when the store opened that morning, he had 35.75 pounds of hamburger to sell. how much hamburger does the manager have left to sell? lb

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.