There are two bags of rice, A and B, and the rice in bag A is 20 kilograms. If it is poured from bag B to bag A (1/4), the weight of the two bags of rice will be the same. How many kilograms of rice did bag B originally contain?
有甲乙两袋大米，甲袋大米20千克，如果从乙袋中倒出给甲袋(1/4)，两袋大米就一样重，乙袋大米原来装大米多少千克．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">20 / (1/2)</gadget>
<output>40</output>

<result>40</result>