The school cafeteria used to burn (1/7) tons of coal every day. After reconstruction, it saves (1/12) less coal every day than before. How many tons of coal does the school burn every day now?
学校食堂过去每天烧煤(1/7)吨，经过改建以后，现在每天烧煤比过去节约(1/12)，现在学校每天烧煤多少吨？
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 - (1/12)</gadget>
<output>11/12 = around 0.916667</output>

<gadget id="calculator">(1/7) * (11/12)</gadget>
<output>11/84 = around 0.130952</output>

<result>11/84 = around 0.130952</result>