Answer:
Option C
Explanation:
Let the numbers be $x$ and $y$. Then, $xy=9375$ and $\frac{x}{y}=15$.
$\frac{xy}{(x/y)} =\frac{9375}{15} \Leftrightarrow y^{2} = 625$
$\Leftrightarrow y = 25 \Rightarrow x = 15y = (15 \times 25)= 375$.
$\therefore$ Sum of the numbers $= 375 + 25 = 400$.