You will need to set up a portion to find your best answer.
The 7.5-pound would be a better buy since it is costing 1.02 per pound, while the 6 pound bag is costing 1.045 per pound. In conclusion the 7.5 bag is more expensive since it has more quantity, but in terms of a better buy, it is the choice to go with since you are getting a smaller price per pound.
You multiply 2 by the number of hours, 6.
2x6=12
answer is 12
Infinite number of solutions I believe.
The answer for this is 2732