Xiaoxiao brought 50 yuan and bought a football and 5 badmintons. It is known that a football is 40 yuan, and how much is a badminton.
笑笑带了50元钱，买了一个足球和5个羽毛球，已知一个足球40元，一个羽毛球多少元．
<gadget id="calculator">50 - 40</gadget>
<output>10</output>

<gadget id="calculator">10 / 5</gadget>
<output>2</output>

<result>2</result>