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At an airport, the daily high temperatures, in degrees Celsius, were recorded for 4 consecutive days. If the average (arithmetic mean) high temperature for the 1st, 2nd, and 3rd days was 29 degrees Celsius and the average high temperature for the 2nd, 3rd, and 4th days was 31 degrees Celsius, how much greater was the high temperature on the 4th day than on the 1st day? ______________degree Celsius

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