The rice in the cafeteria is less than the flour (2/5), so the flour is more than the rice ((())/(())).
食堂的大米比面粉少(2/5)，则面粉比大米多((())/(()))．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(2/5) / (3/5)</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>