A kind of sugar water, it is known that sugar accounts for 1/7 of the sugar water, then, how much sugar accounts for water.
一种糖水，已知糖占糖水的(1/7)，那么，糖占水的多少．
<gadget id="calculator">7 - 1</gadget>
<output>6</output>

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

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