Teacher Wang bought a basketball for 90 yuan and 4 footballs for 260 yuan. How much is a basketball more expensive than a football?
王老师买一个篮球花了90元，4个足球花了260元，一个篮球比一个足球贵多少钱？
<gadget id="calculator">260 / 4</gadget>
<output>65</output>

<gadget id="calculator">90 - 65</gadget>
<output>25</output>

<result>25</result>