A bag of rice is eaten (3/5), how much is left in the total.
一袋大米，吃了(3/5)，剩下的占总数的多少．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>