The physical education teacher bought 18 footballs for 720 yuan, and bought the same number of basketballs for 1080 yuan. How much does each basketball cost more than each football?
体育老师用720元钱买了18个足球，还买了数量同样多的篮球花了1080元．每个篮球比每个足球贵多少元？
<gadget id="calculator">1_080 / 18</gadget>
<output>60</output>

<gadget id="calculator">720 / 18</gadget>
<output>40</output>

<gadget id="calculator">60 - 40</gadget>
<output>20</output>

<result>20</result>