A small factory used to use 46.8 tons of water per month. After advocating water conservation, the original annual water consumption can now be used for an extra month. How many tons of water is used on average per month?
一家小型工厂原来每月用水46.8吨，倡导节约用水后，原来一年的用水量现在可多用一个月，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">46.8 * (12/13)</gadget>
<output>43.2</output>

<result>43.2</result>