Teacher Jiang bought a CD for 26 yuan, and bought 5 floppy disks for 75 yuan. How much cheaper is a floppy disk than a CD?
江老师买一张光碟用去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>