A school used 5 tons less water in December than in November, which is (1/6) less than in November. How many tons of water is used in December.
某学校十二月份比十一月份少用水5吨，比十一月份节约了(1/6)．十二月份用水多少吨．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">5 / (1/6)</gadget>
<output>30</output>

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

<gadget id="calculator">30 * (5/6)</gadget>
<output>25</output>

<result>25</result>