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Cold air math problem
The temperature will drop by 10℃ to 20℃, which means at least 10℃ and at most 20℃.

According to this idea, the maximum temperature will drop by at least 10 degrees, which means-10+6=-4℃.

The minimum temperature drops by 20℃ at most, that is,-1℃+(-20℃) =-31℃.

Therefore, the highest temperature in this city will not be higher than -4℃ and the lowest temperature will not be lower than -3 1℃ the next day.