For a bag of flour, the mass ratio of what is eaten to what is left is 3:5, and there is ((())/(())) of the bag of rice left.
一袋面粉，吃去的与剩下的质量比是3：5，还剩这袋大米的((())/(()))．
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>