Teacher Ma bought 6 basketballs and 9 footballs for a total of 229.5 yuan. It is known that each football is 11.5 yuan, so how much is each basketball?
马老师买6个篮球和9个足球一共用了229.5元，已知每个足球11.5元，那么每个篮球多少钱？
<gadget id="calculator">9 * 11.5</gadget>
<output>103.5</output>

<gadget id="calculator">229.5 - 103.5</gadget>
<output>126</output>

<gadget id="calculator">126 / 6</gadget>
<output>21</output>

<result>21</result>