The original grain store had (2/5) tons of flour, but (3/4) tons were shipped in, and (5/6) tons were sold. How many tons are left?
粮店原有面粉(2/5)吨，又运来(3/4)吨，卖出了(5/6)吨．还剩下多少吨？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(3/4) - (5/6)</gadget>
<output>-1/12 = around -0.083333</output>

<gadget id="calculator">(2/5) + (-1/12)</gadget>
<output>19/60 = around 0.316667</output>

<result>19/60 = around 0.316667</result>