There are two bottles, A and B, and bottle A contains 12 liters of water. If (1/5) is poured into bottle A from bottle B, the water in the two bottles is the same. How many liters of water did bottle B originally hold?
甲乙两个瓶，甲瓶装水12升，若从乙瓶中倒出(1/5)给甲瓶，两瓶中的水同样多，乙瓶原来装水多少升？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5) - (1/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">12 / (3/5)</gadget>
<output>20</output>

<result>20</result>