The fruit shop shipped 14 baskets of pears, weighing 840 kg in total, and 16 baskets of apples, weighing 640 kg in total. How much is each basket of apples lighter than each basket of pears? (calculate with a calculator)
水果店运来14筐梨，共重840千克，又运来16筐苹果，共重640千克．每筐苹果比每筐梨轻多少千克？(用计算器计算)
<gadget id="calculator">840 / 14</gadget>
<output>60</output>

<gadget id="calculator">640 / 16</gadget>
<output>40</output>

<gadget id="calculator">60 - 40</gadget>
<output>20</output>

<result>20</result>