There are 324 tons of grain stored in the two warehouses of A and B. If it is transferred (2/7) from warehouse A to warehouse B, then warehouse B is 4 tons more than warehouse A. How many tons does A warehouse have?
甲乙两个仓库共存粮324吨．如果从甲仓调(2/7)放入乙仓，这时乙仓比甲仓多4吨．甲仓原有多少吨？
<gadget id="calculator">324 - 4</gadget>
<output>320</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">(5/7) + (5/7)</gadget>
<output>10/7 = around 1.428571</output>

<gadget id="calculator">320 / (10/7)</gadget>
<output>224</output>

<result>224</result>