Warehouse A has 20 tons of rice, and B has 18 tons of rice. How many tons are shipped from A to B? A and B are the same.
甲仓库有20吨大米，乙有18吨大米，从甲运多少吨给乙后甲与乙相同．
<gadget id="calculator">20 - 18</gadget>
<output>2</output>

<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<result>1</result>