Railway Recruitment Board Mathematics — Question 1728
Question
If a + b = 10 and a − b = 4, what is the value of a?
- 5
- 7
- 3
- 6
Correct answer
B — 7
Explanation (English)
Adding the two equations: (a+b) + (a−b) = 10 + 4 → 2a = 14 → a = 7.
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