7 boxes of oranges, after taking out 20 kilograms from each box of oranges, the remaining weight is equivalent to the weight of the original 3 boxes, how many kilograms did each box of oranges weigh?
7箱桔子，从每箱桔子中取出20千克后，剩下的重量相当于原来3箱的重量，原来每箱桔子重多少千克？
<gadget id="calculator">20 * 7</gadget>
<output>140</output>

<gadget id="calculator">7 - 3</gadget>
<output>4</output>

<gadget id="calculator">140 / 4</gadget>
<output>35</output>

<result>35</result>