A box of biscuits, the weight of the biscuits and the box is 680 grams. Take out 20 grams of biscuits. At this time, the weight of the biscuits is 540 grams compared with the box. How many grams does the biscuit weigh?
一盒饼干，饼干与盒共重680克，取出饼干20克，这时饼干比盒重540克，则饼干重多少克？
<gadget id="calculator">540 + 20</gadget>
<output>560</output>

<gadget id="calculator">680 + 560</gadget>
<output>1_240</output>

<gadget id="calculator">1_240 / 2</gadget>
<output>620</output>

<result>620</result>