bottle bottle bottle = 30 -- We can thus assume each bottle's value is 10.
bottle bun bun = 20 -- Here, we can assume each set of bun equals to 5. So, 10 5 5 = 20
bun beer beer = 9 -- So, the value of the beer is 2, making it 5+2+2 = 9
Based on this, bun , beer bottle = 17 (5 2 10 = 17). So the answer is simply 17