Aunt Zhang said: "My electricity bill in the first half of the year was 205.5 yuan." Uncle Gu said: "My electricity bill in the second quarter is 109.5 yuan." Which family spends more on average monthly electricity bills? How much?
张大妈说："我家上半年电费205.5元．"顾大爷说："我家第二季度的电费是109.5元．"谁家平均每月花的电费多？多多少？
<gadget id="calculator">109.5 / 3</gadget>
<output>36.5</output>

<gadget id="calculator">205.5 / 6</gadget>
<output>34.25</output>

<gadget id="calculator">36.5 - 34.25</gadget>
<output>2.25</output>

<result>2.25</result>