Xiao Ming went to the supermarket and bought 3 footballs, paid the salesperson 100 yuan, and got back 31 yuan. How much is each football?
小明去超市买了3个足球，付给营业员100元钱，找回31元钱，每个足球多少元钱？
<gadget id="calculator">100 - 31</gadget>
<output>69</output>

<gadget id="calculator">69 / 3</gadget>
<output>23</output>

<result>23</result>