Missing exponent?

Question

$\frac{256}{2^S}=64$

How would you solve for S?

Answer 1

FURTHER HINT: $\mathrm{log}_2(2^{x}) = x$

Answer 2

Hint: $256=2^8$, $64=2^6$, and remember the rule $2^x/2^y = 2^{x-y}$.