The school bought 15 footballs for 780 yuan and bought the same number of basketballs for 525 yuan. How much is each football more expensive than each basketball?
学校买了15只足球用去780元，买了同样多的篮球用去了525元，每只足球比每只篮球贵多少元？
<gadget id="calculator">780 / 15</gadget>
<output>52</output>

<gadget id="calculator">525 / 15</gadget>
<output>35</output>

<gadget id="calculator">52 - 35</gadget>
<output>17</output>

<result>17</result>