Buy 3 basketballs and pay 100 yuan, get back 25 yuan, how much is each basketball?
买3个篮球付100元，找回25元，每个篮球多少元？
<gadget id="calculator">100 - 25</gadget>
<output>75</output>

<gadget id="calculator">75 / 3</gadget>
<output>25</output>

<result>25</result>