Aunt Wang went to buy 3 footballs, paid the salesperson 500 yuan, and got 35 yuan back. How much is an average football?
王阿姨去买3个足球，付给营业员500元，找回35元．平均每个足球多少元？
<gadget id="calculator">500 - 35</gadget>
<output>465</output>

<gadget id="calculator">465 / 3</gadget>
<output>155</output>

<result>155</result>