Buy 5 identical basketballs, pay 500 yuan, get back 45 yuan. How much is each basketball?
买5个相同的篮球，付出500元，找回45元．每个篮球多少元？
<gadget id="calculator">500 - 45</gadget>
<output>455</output>

<gadget id="calculator">455 / 5</gadget>
<output>91</output>

<result>91</result>