One barrel of peanut oil, use up (2/5), what fraction of this barrel of peanut oil is left?
一桶花生油，用去(2/5)，这桶花生油还剩下几分之几？
<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>

<result>3/5 = around 0.6</result>