Xiaoming's family has 15 chickens, the number of ducks is chicken (2/3), and the number of rabbits (2/7). How many rabbits are there?
小明家有鸡15只，鸭的只数是鸡的(2/3)，又是兔的(2/7)．兔有多少只？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(2/3) / (2/7)</gadget>
<output>7/3 = around 2.333333</output>

<gadget id="calculator">15 * (7/3)</gadget>
<output>35</output>

<result>35</result>