There are 9 people playing football on the playground. The number of people playing football is equal to the number of people playing badminton (9/10). How many people are playing badminton?
操场上踢足球的有9人，踢足球的人数是打羽毛球人数的(9/10)，打羽毛球的有多少人？
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">9 / (9/10)</gadget>
<output>10</output>

<result>10</result>