An engineering team dug a 600-meter-long canal. It has been dug for 6 days, 75 meters per day, and the remaining 3 days have been dug, how many meters per day on average?
某工程队挖一条600米长的水渠．已经挖了6天，每天挖75米，剩下的3天挖完，平均每天挖多少米？
<gadget id="calculator">75 * 6</gadget>
<output>450</output>

<gadget id="calculator">600 - 450</gadget>
<output>150</output>

<gadget id="calculator">150 / 3</gadget>
<output>50</output>

<result>50</result>