The school used 100 tons of water in October, saving 25 tons compared to September. How much is the saving?
学校10月份用水100t，比9月份节约25t，节约了百分之几？
<gadget id="calculator">25 + 100</gadget>
<output>125</output>

<gadget id="calculator">25 / 125</gadget>
<output>1/5 = around 0.2</output>

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