The total length of the bridge is 320 meters, and a bridge pier is set every 40 meters (both sides are counted). How many piers should be set in total?
大桥全长320米，每隔40米设置一个桥墩(两边都算)，一共要设置多少个桥墩？
<gadget id="calculator">320 / 40</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>