The school held a running competition on Children's Day. Xiaofang can run 300 meters per minute, 20 meters more than Xiaojun (2/3) per minute. How many meters can Xiaojun run per minute? (Solution of column equation)
学校在六一儿童节这天举行跑步比赛，小芳每分钟可跑300米，比小军每分钟跑的(2/3)还多20米，小军每分钟跑多少米？(列方程解)
<gadget id="calculator">300 - 20</gadget>
<output>280</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">280 / (2/3)</gadget>
<output>420</output>

<result>420</result>