Doubt in Timed Quant Medium Tests (Gregmat) I Sample#8 I

Hi!

Confused in this question:

Here, my inference, when I converted words to algebra was: x=n^6.
But this is wrong as per the solution, which states that it should be x=6^n.

Can you help me what is the key word I should be watching out for in such questions?

“number” = “power of 6”

Gotcha, thanks!