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4. In order to save water, all the Lianhua Community used water-saving faucets at the end of last year. Grandma Zhang’s house and Grandma Li’s house

The average monthly water savings of Grandma Zhang’s family:

39.6÷6=6.6 (yuan),

The average monthly water savings of Grandma Li’s family Fee:

24÷3=8 (yuan),

6.6 yuan; 8 yuan,

So the average monthly water bill saved by Grandma Li’s family A lot,

Answer: Grandma Li’s family saves a lot of water on average every month.