The canteen of a factory used to use (2/5) tons of coal per day. After the boiler is remodeled, it saves (1/6) per day compared to the original one. How many tons of coal is saved per day?
某工厂食堂原来每天用煤(2/5)吨，改造锅炉后，每天比原来节约(1/6)，每天节约用煤多少吨？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(2/5) * (1/6)</gadget>
<output>1/15 = around 0.066667</output>

<result>1/15 = around 0.066667</result>