Xiaohong did 16 questions yesterday and today, and yesterday she did 10 questions. How many questions did Xiaohong do today?
小红昨天和今天共做了16道题，昨天做了10道，小红今天做了几道题？
<gadget id="calculator">16 - 10</gadget>
<output>6</output>

<result>6</result>