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Railways PYQCBT 2 2017

RRB NTPC · Question 76

If (2a/m + b/n) = 2 and (a/m - b/n) = 4, find the values of 'a' and 'b' respectively.

  1. 2m, -2n

  2. -2n, 2m

  3. 2m, 2n

  4. -2m, 2n

Show answer & explanation

Answer: (A) 2m, -2n

Explanation

Let x = a/m and y = b/n. Then 2x + y = 2 and x − y = 4. Adding: 3x = 6, so x = 2 and y = −2. Hence a = 2m and b = −2n.