Xiaohong's family used 15 tons of water in September and 12 tons in October. How much was the savings in October compared to September? How much more is September than October?
小红家九月份用水15吨，十月份用水12吨．十月份比九月份节约了百分之几？九月份比十月份多百分之几？
<gadget id="calculator">3 / 12</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>