There are 5 boxes of biscuits in a grocery store. If 20 kg are taken out of each box, the remaining biscuits in the 5 boxes are exactly equal to the weight of the original 3 boxes of biscuits. How many kilograms of biscuits are in each box?
某食品店有5箱饼干，如果从每个箱子里取出20千克，那么5个箱子里剩下的饼干正好等于原来3箱饼干的重量．原来每个箱子里袋多少千克饼干？
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">20 * (5/2)</gadget>
<output>50</output>

<result>50</result>