Li Ming's family used 6 tons of water in September, and paid a total water fee of a yuan. How much is each ton of water.
李明家九月份用水6吨，共交水费a元，每吨水多少元．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>