The total length of the No. 11 bus route is 21km. If the distance between two adjacent stations is 1.5km, how many stations should be set up in total?
11路公共汽车行驶路线全长21km，若相邻两站之间的路程都是1.5km，则一共要设多少个车站．
<gadget id="calculator">21 / 1.5</gadget>
<output>14</output>

<gadget id="calculator">14 + 1</gadget>
<output>15</output>

<result>15</result>