Warehouse A has 660 tons of grain, and Warehouse B has 480 tons of grain. After how many tons of grain is given to Warehouse B by Warehouse A, will Warehouse A and Warehouse B have the same amount of grain?
甲仓库有粮食660吨，乙仓库有粮食480吨，甲仓库给乙仓库多少吨粮食后，甲、乙两个仓库的粮食同样多？
<gadget id="calculator">660 + 480</gadget>
<output>1_140</output>

<gadget id="calculator">1_140 / 2</gadget>
<output>570</output>

<gadget id="calculator">570 - 480</gadget>
<output>90</output>

<result>90</result>