The school planned to use (5/6) tons of coal in December, but actually saved (1/6) compared to the plan. How many tons of coal is actually used?
学校计划十二月份用煤(5/6)吨，实际比计划节约了(1/6)．实际用煤多少吨？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

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

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(5/6) * (5/6)</gadget>
<output>25/36 = around 0.694444</output>

<result>25/36 = around 0.694444</result>