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Railways PYQCBT 1 2016

RRB NTPC · Question 63

If a + 2b = 55 and a – 2b = - 13, find the value of b. A. 21 B. 14 C. 17 D. 19

  1. D

  2. A

  3. C

  4. B

Show answer & explanation

Answer: (C) C

Explanation

Subtract the second equation from the first: (a + 2b) − (a − 2b) = 55 − (−13), so 4b = 68 and b = 17.