The correct answer is 26. 
Here’s the step-by-step explanation:
- First equation: Three beers (each with 2 biscuits)equal 30, so each beer with two biscuits is worth 10.
- Second equation: Two burgers plus one beer (with two biscuits) equal 20:
- Burger + Burger + 10 = 20
- Each burger = 5.
- Third equation: One burger plus two groups of 4 biscuits equals 13:
- 5 + 4 + 4 = 13
- Therefore, each biscuit = 1.
Now look carefully at the final equation:
- The beer no longer contains the two biscuits, so its value is:
- 10 − 2 = 8
- The double burger is worth:
- 2 × 5 = 10
- The final expression is:
Double Burger + 2 Biscuits × Beer (without biscuits)
Substitute the values:
10 + 2 × 8
Apply the order of operations (multiplication before addition):
- 2 × 8 = 16
- 10 + 16 = 26
Final Answer: 26
