In October, water was saved by 10% compared with September, which is exactly 36 tons. How many tons of water was used in September? (Draw the unit "1" first, and then list the quantitative relationship)
十月份比九月份节约用水10%，正好节约了36吨，九月份用水多少吨？(先画出单位"1"，再列出数量关系)
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">36 / (1/10)</gadget>
<output>360</output>

<result>360</result>