Zachary and Xavier had water bottles that contained the same amount of water.<br>Zachary drank $$ \frac{7}{10}$$ of the water in his water bottle.<br> Xavier drank $$ \frac{4}{5}$$ of the water in his water bottle.<hr> Xavier drunk $$ \frac{A}{B}$$ more water than Zachary. <hr>A: <input min="0" type="number" class="lineinput" placeholder="?" /><br>B: <input min="0" type="number" class="lineinput" placeholder="?" />