Steps to solve the problem:

1, condition: Erase the last zero of the electricity bill, which is the same as the water bill. Analysis shows that the electricity bill is "the last zero", that is, it is a little zero. Removing this 0 is equivalent to imposing 10 mathematically, and the logical relationship between electricity fee ÷ 10= water fee can be obtained;

2. Conditions: water and electricity *** 165 yuan.

The equation water fee+electricity fee = 165 can be established, and then the "electricity fee ÷ 1 0 = water fee" derived from step1is substituted into the equation electricity fee+electricity fee ÷165.

3. After getting the result of electricity charge, the water charge will of course be easy to calculate.