The teacher bought 5 footballs for 325 yuan and 8 basketballs for 640 yuan. How much does each basketball cost more than a football?
老师买5个足球用了325元，8个篮球用了640元．每个篮球比足球贵多少元？
<gadget id="calculator">640 / 8</gadget>
<output>80</output>

<gadget id="calculator">325 / 5</gadget>
<output>65</output>

<gadget id="calculator">80 - 65</gadget>
<output>15</output>

<result>15</result>