There is a road with a length of 200 meters. Trees are planted every 4 meters on both sides of the road. How many trees are planted in total?
有一条长200米的路，在路的两边从头到尾每隔4米植树一棵，一共植树多少棵？
<gadget id="calculator">200 / 4</gadget>
<output>50</output>

<gadget id="calculator">50 + 1</gadget>
<output>51</output>

<gadget id="calculator">51 * 2</gadget>
<output>102</output>

<result>102</result>