On a runway with a circumference of 400 meters in a school, a red flag is inserted every 8 meters, and a yellow flag is inserted every 2 meters between two adjacent red flags. How many red flags and yellow flags should be prepared?
在某校周长为400米的跑道上，每隔8米插一面红旗，然后在相邻两面红旗中间每隔2米插一面黄旗，应该准备红旗和黄旗一共多少面．
<gadget id="calculator">400 / 2</gadget>
<output>200</output>

<gadget id="calculator">400 / 8</gadget>
<output>50</output>

<gadget id="calculator">200 - 50</gadget>
<output>150</output>

<gadget id="calculator">150 + 50</gadget>
<output>200</output>

<result>200</result>