A bag of rice is 40 kilograms, eat (3/4) of the total amount, how much of the total amount is left.
一袋大米40千克，吃了总数的(3/4)，还剩总数的多少．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>