Lu Xiaohao's family paid 156 yuan for electricity in the third quarter, of which 48 yuan was spent in September. May I ask how much is the average monthly electricity bill for the two months of July and August?
陆小昊家第三季度缴纳电费156元，其中9月份花费48元．请问7、8两个月平均每月缴纳电费多少元？
<gadget id="calculator">156 - 48</gadget>
<output>108</output>

<gadget id="calculator">108 / 2</gadget>
<output>54</output>

<result>54</result>