970 bags of cement were shipped to the construction site. After 3 days of use, there are 430 bags left. How many bags of cement are used on average per day?
建筑工地运来970袋水泥．用了3天，还剩430袋，平均每天用多少袋水泥？
<gadget id="calculator">970 - 430</gadget>
<output>540</output>

<gadget id="calculator">540 / 3</gadget>
<output>180</output>

<result>180</result>