Chloe ate part of a cheese cake and left $$ \frac{3}{7}$$ of it.&nbsp;<div>She ate $$ \frac{A}{B}$$ of the cheesecake. What is A and B?<hr>A: <input min="0" type="number" class="lineinput" placeholder="?"><br>B: <input min="0" type="number" class="lineinput" placeholder="?"></div>