Li Ming recorded the number of electric meters in June. The results are as follows:1234567+07120124129135138142 respectively. What was Li Ming's electricity consumption on June 30th?

The electricity consumption of No.2 is 124- 120=4.

3………………………=5

4………………………=6

5………………………-3

The electricity consumption of No.6 is 142- 138=5.

So the average daily electricity consumption in the first six days is (3+4+5+6+3+5)/6=4.3 degrees.

* * * The total electricity consumption for 30 days is: 4.3*30= 129 kWh.