Apples and pears are 680 kg in total. Apples are packed in a basket of 50 kg. There are 8 baskets in total. Pears are packed in a basket of 40 kg. How many baskets of pears should be loaded?
苹果和梨共680千克，苹果每50千克装一筐，共装了8筐，梨每40千克装一筐．梨要装多少筐？
<gadget id="calculator">50 * 8</gadget>
<output>400</output>

<gadget id="calculator">680 - 400</gadget>
<output>280</output>

<gadget id="calculator">280 / 40</gadget>
<output>7</output>

<result>7</result>