A car pulls 500 boxes of bread, and after delivering them to 15 retail outlets on average, there are still 20 boxes left. How many boxes of bread are delivered to each retail outlet on average?
一辆汽车拉了500箱面包，平均送到15个零售点后，还剩下20箱，平均每个零售点送了几箱面包？
<gadget id="calculator">500 - 20</gadget>
<output>480</output>

<gadget id="calculator">480 / 15</gadget>
<output>32</output>

<result>32</result>