A factory originally used 468 tons of water per month. After saving water, the original year’s water consumption can now be used for an extra month. How many tons of water is used on average per month?
一个工厂原来每月用水468吨，节约用水后，原来1年的用水量现在可以多用1个月，现在平均每月用水多少吨？
<gadget id="calculator">12 + 1</gadget>
<output>13</output>

<gadget id="calculator">12 / 13</gadget>
<output>12/13 = around 0.923077</output>

<gadget id="calculator">468 * (12/13)</gadget>
<output>432</output>

<result>432</result>