Teacher Jiang spent 26 yuan to buy a CD, and 75 yuan to buy 5 floppy disks. How much is a floppy disk cheaper than a CD?
江老师买一张光盘用去26元，买5张软盘用去75元．一张软盘比一张光盘便宜多少元？
<gadget id="calculator">75 / 5</gadget>
<output>15</output>

<gadget id="calculator">26 - 15</gadget>
<output>11</output>

<result>11</result>