The supermarket shipped back 240 boxes of noodles. After 3 days of selling, there were still 90 boxes left. How many boxes of noodles does the supermarket sell on average every day?
超市运回了240箱面条，卖了3天后，还剩90箱，超市平均每天卖多少箱面条？
<gadget id="calculator">240 - 90</gadget>
<output>150</output>

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

<result>50</result>