A and B have two bags of rice, pour (1/10) from bag A to bag B, then the weight of the two bags of rice is equal, the weight of the original bag of rice is the same as that of bag A.
甲乙两袋米，从甲袋倒(1/10)到乙袋，则两袋米的重量相等，原来乙袋米的重量是甲袋的多少．
<gadget id="calculator">1 / 10</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">(4/5) / 1</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>