There are 1,800 tons of wheat stored in two granaries. If 400 tons are transported from A warehouse, the weight of the remaining wheat in A warehouse is exactly (3/4) of that in B warehouse. How many tons of wheat did warehouse B originally store?
两个粮仓共存小麦1800吨，如果从甲仓运走400吨，甲仓余下的小麦重量正好是乙仓的(3/4)．乙仓原来存小麦多少吨？
<gadget id="calculator">1_800 - 400</gadget>
<output>1_400</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">1_400 * (4/7)</gadget>
<output>800</output>

<result>800</result>