Task: Question Answering
Input (English): Question: The average of 1st 3 of 4 numbers is 7 and of the last 3 are 5. If the sum of the first and the last number is 13. What is the last numbers?

 Option A: 4

 Option B: 5

 Option C: 3.5

 Option D: 7

 Option E: 8
Output (English): Option C