At the end of last year, Qingfeng District switched to water-saving faucets. Grandma Zhang’s family saved 46.2 yuan in water bills in the first half of this year, and Grandma Li’s family saved 26.7 yuan in water bills in the third quarter. Which family saves more water bills per month on average? How much is it?
清风小区去年年底全部改用了节水龙头．张奶奶家今年上半年节约水费46.2元，李奶奶家第三季度节约水费26.7元，谁家平均每月节约的水费多？多几元？
<gadget id="calculator">26.7 / 3</gadget>
<output>8.9</output>

<gadget id="calculator">46.2 / 6</gadget>
<output>7.7</output>

<gadget id="calculator">8.9 - 7.7</gadget>
<output>1.2</output>

<result>1.2</result>