Hey sameeranand21.

Are you familiar with logarithms in arbitrary bases?

SQRT(5)/25 = SQRT(5)/[SQRT(5)*5*SQRT(5)] = 1/[5*SQRT(5)] = 5^(-3/2) = 5^(3-x).

So you can use logarithms or use the fact that if 5^x = 5^y then x = y (also known as injective property of function).