In order to encourage residents to save water, the water company stipulates that each household pays 12.5 yuan for water consumption of less than 5 tons (including 5 tons) per month, and when the water exceeds 5 tons, the excess part is 3.2 yuan per ton. Liangliang’s family paid a total water fee of 36.5 yuan this month. How many tons of water did Liangliang’s family use this month?
为鼓励居民节约用水，自来水公司规定：每户每月用水5吨以下(包括5吨)交水费12.5元，当超过5吨时，超过的部分每吨3.2元．亮亮家本月共交水费36.5元，亮亮家本月用水多少吨？
<gadget id="calculator">36.5 - 12.5</gadget>
<output>24</output>

<gadget id="calculator">24 / 3.2</gadget>
<output>7.5</output>

<gadget id="calculator">7.5 + 5</gadget>
<output>12.5</output>

<result>12.5</result>