A company holds a tea party to welcome the new year, and buys 5 boxes of apples with the same weight. After taking out 20.4 kg from each box, the sum of the masses of the remaining apples in each box is exactly equal to the mass of 2 boxes of apples. So how much does each box weigh? kilogram?
某公司举行迎新春茶话会，买来5箱同样重的苹果，从每箱中取出20.4千克后，各箱所剩下的苹果质量的和正好等于2箱苹果的质量，那么原来每箱苹果重多少千克？
<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">20.4 / 3</gadget>
<output>6.8</output>

<gadget id="calculator">5 * 6.8</gadget>
<output>34</output>

<result>34</result>