Xiaogang's family paid 168 yuan for water in the first half of the year, and an average of 24 yuan per month for the second half of the year. How much is Xiaogang's average monthly water bill this year?
小刚家上半年缴水费168元，下半年平均每月缴水费24元．小刚家今年平均月缴水费多少元．
<gadget id="calculator">24 * 6</gadget>
<output>144</output>

<gadget id="calculator">144 + 168</gadget>
<output>312</output>

<result>312</result>