I have to walk about 200 steps for 100 meters. I walk 800 steps along the runway of the school playground. How many meters is the runway of the school playground?
100米我大约要走200步，沿着学校操场的跑道走一圈我走了800步，学校操场跑道大约多少米．
<gadget id="calculator">100 / 200</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 800</gadget>
<output>400</output>

<result>400</result>