Buy 4 small basketballs, pay 100 yuan, get back 8 yuan, how much is each small basketball.
买4个小篮球，付出100元，找回8元，每个小篮球多少元．
<gadget id="calculator">100 - 8</gadget>
<output>92</output>

<gadget id="calculator">92 / 4</gadget>
<output>23</output>

<result>23</result>