The school needs 950 yuan to buy back 15 basketballs and 20 footballs. Given that each basketball costs 30 yuan, how much does each football cost? (Only the comprehensive formula is listed, no calculation is required)
学校买回15个篮球和20个足球共需要950元，已知每个篮球30元，每个足球需要多少元？(只列综合式，不用计算)
<gadget id="calculator">30 * 15</gadget>
<output>450</output>

<gadget id="calculator">950 - 450</gadget>
<output>500</output>

<gadget id="calculator">500 / 20</gadget>
<output>25</output>

<result>25</result>