Question

A number to the 8th power divided by the same number to the 5th power equals27. What is the number

Answer 1

3 is the answer. 
n^8/n^5=27 
$n^3=27$
$\sqrt[3]{n} = \sqrt[3]{27}$
n=3

Answer 2

remember

$\frac{x^m}{x^n}=x^{m-n}$

so

x=x
$\frac{x^8}{x^5}=27=x^{8-5}=x^3$

27=x³
take cube root or use multiplication tables
3=x

da number is 3