The water consumption in May is less than that in April (1/9), and the water consumption in May is the amount in April.
五月份的用水量比四月份节约(1/9)，五月份的用水量是四月份的多少．
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">9 * (1/9)</gadget>
<output>1</output>

<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<result>8/9 = around 0.888889</result>