There are two bags of rice, the first bag of rice weighs 20 kg, if you take out (2/5) from the second bag and put it into the first bag, the weight of the two bags of rice will be the same. How many kilograms do these two bags of rice weigh together? (answered in two different ways)
有两袋大米，第一袋大米重20千克，如果从第二袋中取出(2/5)放入第一袋中，两袋大米就同样重．这两袋大米一共重多少千克？(用两种不同方法解答)
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">20 / (1/5)</gadget>
<output>100</output>

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

<result>120</result>