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Railways PYQCBT 1 2016

RRB NTPC · Question 79

The product of two numbers is 24 and the sum of their squares is 52. Find their sum. A. 5 B. 10 C. 15 D. 20

  1. D

  2. C

  3. B

  4. A

Show answer & explanation

Answer: (C) B

Explanation

(a + b)² = a² + b² + 2ab = 52 + 2 × 24 = 100, so a + b = 10. (The numbers are 6 and 4.)