Two bags of rice, A and B, each weigh 80 kilograms, and 20 kilograms are poured from bag A to bag B. At this time, the mass of bag A is the same as that of bag B.
甲乙两袋大米各重80千克，从甲袋倒出20千克给乙袋，这时甲袋的质量是乙袋的多少．
<gadget id="calculator">80 - 20</gadget>
<output>60</output>

<gadget id="calculator">80 + 20</gadget>
<output>100</output>

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>