A pile of sand has (2/3) tons, 250 kg is used on the first day, and (2/5) tons is used on the second day, how many tons are left?
一堆沙有(2/3)吨，第一天用去250千克，第二天用去(2/5)吨，还剩下多少吨？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/3) - (1/4) - (2/5)</gadget>
<output>1/60 = around 0.016667</output>

<result>1/60 = around 0.016667</result>