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Question

If x + 2y = 27 and x - 2y = -1, find the value of y.

This question was previously asked in
RRB NTPC 2015 CBT 1 Question Paper (29-Mar-2016) (Shift 1)
The correct answer is

7

Add the two equations: (x+2y) + (x−2y) = 27 + (−1) → 2x = 26 → x = 13.

Subtract: (x+2y) − (x−2y) = 27 − (−1) → 4y = 28 → y = 7.

So y = 7.

Hence, 7.

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