A box of apples weighs 69.6 kilograms. After selling half of them, the weight of the box is 36.8 kilograms. How many kilograms are there in the box?
一箱苹果连箱重69.6千克，卖出一半后，连箱重36.8千克，箱有多少千克．
<gadget id="calculator">69.6 - 36.8</gadget>
<output>32.8</output>

<gadget id="calculator">32.8 * 2</gadget>
<output>65.6</output>

<gadget id="calculator">69.6 - 65.6</gadget>
<output>4</output>

<result>4</result>