There are two boxes of oranges, A and B. The weight of box A is 180 kg, and the weight of box B is 120 kg. Take some oranges from box B and put them into box A. At this time, the number of oranges in box A is twice that of box B. Ask if you take oranges from box B. How many kilograms of oranges are put into box A?
甲、乙两箱桔子，甲箱重180千克，乙箱重120千克，从乙箱拿出一些桔子放入甲箱，这时甲箱的桔子是乙箱的2倍，问从乙箱拿了多少千克桔子放入甲箱？
<gadget id="calculator">180 + 120</gadget>
<output>300</output>

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">300 / 3</gadget>
<output>100</output>

<gadget id="calculator">120 - 100</gadget>
<output>20</output>

<result>20</result>