The answer Peter will consume 60 sixpacks of Miller lite per year.
The solution for this problem is:
The cost of 6 Miller six packs is 5 * 6 = 30.
Then the cost of 2 Bud cases is 30 * 2 = 60.
Consequently, Miller is low-priced so Peter will buy as much Miller as possible. Therefore, 300 which is the budget divided by 5 is the cost for the Miller sixpacks = 60