The ratio of inventory tonnage between warehouse A and warehouse B is 7:3. If warehouse A transports 100 tons, the ratio of inventory between warehouse A and warehouse B is 11:9. How many tons does warehouse A have?
甲乙两仓库存货吨数之比为7：3，如果甲仓库运走100吨，甲乙两仓库存货之比为11：9，甲仓库原有多少吨货．
<gadget id="calculator">7 / 3</gadget>
<output>7/3 = around 2.333333</output>

<gadget id="calculator">11 / 9</gadget>
<output>11/9 = around 1.222222</output>

<gadget id="calculator">(7/3) - (11/9)</gadget>
<output>10/9 = around 1.111111</output>

<gadget id="calculator">100 / (10/9)</gadget>
<output>90</output>

<gadget id="calculator">90 * (7/3)</gadget>
<output>210</output>

<result>210</result>