We know that if we multiply 25% by 4, we get 100%. So if we apply the same rule to 20, we find that 20 is 25% (or 1/4) of 80. This can be proven by dividing 80 by 4, which does indeed equal 20, so we know this is true.
So the answer to this question is that 20 is 25% of 80.
