Aunt Chen in the kindergarten bought 7 balls for 56 yuan and 1 basketball for 25 yuan. How much is a basketball more expensive than a ball?
幼儿园的陈阿姨用56元钱买了7个皮球，用25元钱买了1个篮球，一个篮球比一个皮球贵多少元？
<gadget id="calculator">56 / 7</gadget>
<output>8</output>

<gadget id="calculator">25 - 8</gadget>
<output>17</output>

<result>17</result>