The school bought 56 volleyballs, equivalent to football (7/9), how many footballs did it buy?
学校买56个排球，相当于足球的(7/9)，买来多少个足球？
<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">56 / (7/9)</gadget>
<output>72</output>

<result>72</result>