This year, Honghong’s family collected 750 kilograms of apples and sold 350 kilograms. Pack the rest into cartons. If each carton holds 20kg of apples, how many more cartons are needed?
红红家今年共收苹果750千克，卖出350千克．剩下的全部装入纸箱，如果每个纸箱装20千克苹果，那还需要多少个纸箱？
<gadget id="calculator">750 - 350</gadget>
<output>400</output>

<gadget id="calculator">400 / 20</gadget>
<output>20</output>

<result>20</result>