There are two bags of mung beans, A and B, and 10% is poured out from bag A to bag B. Two bags of mung beans have the same weight, how much less mung beans in bag B than in bag A
有甲、乙两袋绿豆，由甲袋倒出10%给乙袋后．两袋绿豆的重量相等，原来乙袋绿豆比甲袋少多少
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) * 2</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>