Dig a canal 850 meters long, dig 75 meters every day, after a few days of digging, the remaining is 100 meters more than what has been dug. How many days have you been digging?
挖一条长850米的水渠，每天挖75米，挖了几天后，剩下的比已挖的多100米．已经挖了多少天？
<gadget id="calculator">850 - 100</gadget>
<output>750</output>

<gadget id="calculator">75 + 75</gadget>
<output>150</output>

<gadget id="calculator">750 / 150</gadget>
<output>5</output>

<result>5</result>