Task: Question Answering
Input (English): \(x + y = 10\) \(y + z = 15\) \(x + z = 17\) What is the average (arithmetic mean) of \(x\), \(y\), and \(z\)?
(A)7 (B)14 (C)15 (D)21 (E)It cannot be determined from the information given
Output (English): A