2,100-meter-long canal has been built in Daqiao Township for 5 days, with an average of 240 meters per day. The remaining tasks should be completed within 3 days. How many meters should be repaired on average per day?
大桥乡修一条长2100米的水渠，已修了5天，平均每天修240米．余下的任务要在3天内完成，平均每天应修多少米？
<gadget id="calculator">240 * 5</gadget>
<output>1_200</output>

<gadget id="calculator">2_100 - 1_200</gadget>
<output>900</output>

<gadget id="calculator">900 / 3</gadget>
<output>300</output>

<result>300</result>