There are two warehouses, A and B, and the original inventory of warehouse B is 1200 tons. When the goods in warehouse A are transported away (7/15) and the goods in warehouse B are transported away (1/3), then 10% of the remaining goods are taken out from warehouse A and put into warehouse B. The weight of the goods is exactly the same. So how many tons of warehouse A's original inventory?
甲、乙两个仓库，乙仓库原有存货1200吨．当甲仓库的货物运走(7/15)，乙仓库的货物运走(1/3)以后，再从甲仓库取出剩下货物的10%放入乙仓库，这时甲、乙两仓库中的货物重量恰好相等．那么甲仓库原有存货多少吨？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1_200 * (2/3)</gadget>
<output>800</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) * 2</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">800 / (4/5)</gadget>
<output>1_000</output>

<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">1 - (7/15)</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">1_000 / (8/15)</gadget>
<output>1_875</output>

<result>1_875</result>