RRB NTPC · Question 83
If x + y = 19 and x – y = 7, then xy = ?
Show answer & explanation
Answer: (C) 78
Explanation
Adding the equations: 2x = 26, so x = 13 and y = 6. Then xy = 13 × 6 = 78.
Railways PYQCBT 1 2016
RRB NTPC · Question 83
Answer: (C) 78
Adding the equations: 2x = 26, so x = 13 and y = 6. Then xy = 13 × 6 = 78.