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WBCS Main Examination 2023 — Paper VI: Arithmetic and Test of Reasoning · Question 76 of 200

Q76
ArithmeticRatio, Proportion & Mixtures
The mean proportional of 16 and 25 is
  1. a.400
  2. b.100
  3. c.20
  4. d.40

Answer: (C) 20

The mean proportional of a and b is $\sqrt{ab}$, so here it is $\sqrt{16 \times 25} = \sqrt{400} = 20$. 400 is the product itself, not its square root.

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The mean proportional of 16 and 25 is — WBCS Main Examination 2023 Q76 | Prostuti360°