There are 6 boxes of apples with the same weight. If 20 kilograms are taken out of each box, the sum of the remaining apples is equal to the weight of the original 2 boxes of apples. How many kilograms does each box weigh?
有6箱同样重的苹果，如果从每箱中取出20千克，剩下的苹果的总和等于原来2箱苹果的重量，原来每箱苹果重多少千克？
<gadget id="calculator">6 - 2</gadget>
<output>4</output>

<gadget id="calculator">6 / 4</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">20 * (3/2)</gadget>
<output>30</output>

<result>30</result>