Cheryl ate a fraction of a cheese cake. $$ \frac{3}{7}$$ of it was left.<br>Cheryl ate $$ \frac{A}{B}$$ of the cheesecake. <hr>A: <input min="0" type="number" class="lineinput" placeholder="?" /><br>B: <input min="0" type="number" class="lineinput" placeholder="?" />