Xiaohua's family used to use 6.5 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 saved on average per month?
小华家原来每月用水6.5吨，提倡节约用水后，原来一年的用水量，现在可以多用1个月，平均每月节约水多少吨？
<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">6.5 * (12/13)</gadget>
<output>6</output>

<gadget id="calculator">6.5 - 6</gadget>
<output>0.5</output>

<result>0.5</result>