After putting (2/7) of the weight of A bag of rice into B bag, the weight of the two bags of rice is equal. It turns out that A bag has more rice than B bag.
把甲袋米重量的(2/7)放入乙袋后，两袋米重量相等，原来甲袋米比乙袋多多少．
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7) - (2/7)</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (3/7)</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(4/7) / (3/7)</gadget>
<output>4/3 = around 1.333333</output>

<result>4/3 = around 1.333333</result>