Xiaogang’s family used 12 tons of water in September, saving (1/7) compared to August. How many tons of water was used in August?
小刚家九月份用水12吨，比八月份节约了(1/7)，八月份用水多少吨？
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 - (1/7)</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">12 / (6/7)</gadget>
<output>14</output>

<result>14</result>