50% of A is equal to $$\frac{1}{5}$$ of B. Find the ratio of A to the difference between B and A. <br> <input min="0" type="number" id ="imp5pg188q12_1" class="lineinput" placeholder="?" /> : <input min="0" type="number" id ="imp5pg188q12_2" class="lineinput" placeholder="?" />