What is the maximum number of days above 30 degrees at present? This problem can be solved by inequality.
If we consider that the hottest temperature is 30 degrees, the sum of monthly temperatures should be less than or equal to 28.5X30.
According to this idea, it can be set that the temperature above 30 degrees is X days, and the corresponding coldest day should be 30- 10 = 20 degrees, and the number of days is 30-X days.
Accordingly, the inequality equation is: 30x+20 (30-x) is less than or equal to 30X28.5. Solving this does not mean that x is less than or equal to 25.5, so the maximum number of days is 25 days.
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