The water consumption of the school in May is 125% of that in April, so how much less water is used in April than in May?
学校五月份的用水量是四月份的125%，那么四月份用水量比五月份少多少
<gadget id="calculator">125 / 100</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">(5/4) - 1</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / (5/4)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>