36
63
47
81
Correct answer is D
M∝N ; M∝1√P.
∴
M = \frac{k N}{\sqrt{P}}
when M = 3, N = 5 and P = 25;
3 = \frac{5k}{\sqrt{25}}
k = 3
M = \frac{3N}{\sqrt{P}}
when M = 2 and N = 6,
2 = \frac{3(6)}{\sqrt{P}} \implies \sqrt{P} = \frac{18}{2}
\sqrt{P} = 9 \implies P = 9^2
P = 81
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