The school sports room bought 28 volleyballs, equivalent to the number of footballs (7/9). How many footballs did you buy?
学校体育室买来排球28只，相当于足球只数的(7/9)．买来足球多少只？
<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">28 / (7/9)</gadget>
<output>36</output>

<result>36</result>