Hang lanterns on both sides of a 40-meter-long bridge, such as hanging one every 5 meters, how many lanterns are hung on both sides of the bridge?
在一座40米长的桥两旁挂灯笼，如每隔5米挂一个，这座大桥两旁共挂灯笼多少个．
<gadget id="calculator">40 / 5</gadget>
<output>8</output>

<gadget id="calculator">8 + 1</gadget>
<output>9</output>

<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<result>18</result>