There is a road with a length of 900 meters. Street lamps are installed on both sides of the road (both ends are installed), and a street lamp is installed every 10 meters. How many street lamps can be installed?
有一条公路长900米，在公路两侧安装路灯(两端都安)，每隔10米安一盏路灯，可安多少盏路灯？
<gadget id="calculator">900 / 10</gadget>
<output>90</output>

<gadget id="calculator">90 + 1</gadget>
<output>91</output>

<gadget id="calculator">91 * 2</gadget>
<output>182</output>

<result>182</result>