Express the following division sentence as a fraction .Then change it into the simplest form or mixed number where necessary. <br> 21 ÷ 9 = 2$$\frac{A}{B}$$<hr> <input min="0" type="number" class="lineinput" placeholder="A = ？"><br><input min="0" type="number" class="lineinput" placeholder="B= ？">