There are 8 boxes of tea leaves. If 200 grams of tea leaves are added to each box, then the weight of 8 boxes of tea leaves is equivalent to the weight of the original 12 boxes of tea leaves. What is the original weight of each box of tea leaves?
有8盒茶叶，如果把每盒中再加入200克茶叶，那么这时8盒茶叶的重量相当于原来12盒茶叶的重量，原来每盒茶叶重多少克．
<gadget id="calculator">200 * 8</gadget>
<output>1_600</output>

<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">1_600 / 4</gadget>
<output>400</output>

<result>400</result>