Zhangcun dug a 100-meter-long ditch, and 28 meters have been dug. The rest will be dug in 6 days, how many meters per day on average?
张村挖一条100米长的水沟，已经挖好28米．剩下的要6天挖完，平均每天挖多少米？
<gadget id="calculator">100 - 28</gadget>
<output>72</output>

<gadget id="calculator">72 / 6</gadget>
<output>12</output>

<result>12</result>