There are 5 boxes of biscuits for a certain food. If 6 kilograms are taken from each box, the remaining biscuits in the 5 boxes are exactly equal to the original 4 boxes of biscuits. How many kilograms of biscuits are in each box?
某种食品有5箱饼干，如果从每个箱子里取出6千克，那么5个箱子里剩下的饼干正好等于原来4箱的饼干．原来每个箱子里装多少千克饼干？
<gadget id="calculator">5 / 1</gadget>
<output>5</output>

<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<result>30</result>