A volleyball is 16 yuan, exactly the price of a football (4/7). How much is the price of this football?
一只排球16元，正好是一只足球价钱的(4/7)．这只足球的价钱是多少元？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">16 / (4/7)</gadget>
<output>28</output>

<result>28</result>