Question : The mean temperature from Monday to Thursday is 39.25°C. The mean temperature from Thursday to Sunday is 40.25°C. If the sum of the daily temperatures of all the days during the week, from Monday to Sunday, is 277.5°C, then what is the temperature for Thursday?
Option 1: 40.5°C
Option 2: 38.5°C
Option 3: 41.5°C
Option 4: 39.5°C
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Correct Answer: 40.5°C
Solution : The mean temperature from Monday to Thursday is 39.25°C. The sum of the temperatures from Monday to Thursday = 39.25°C × 4 = 157°C The mean temperature from Thursday to Sunday = 40.25°C The sum of the temperatures from Thursday to Sunday = 40.25°C × 4 = 161°C The sum of the daily temperatures from Monday to Sunday = 277.5°C Since Thursday's temperature is counted twice in these sums. Thursday's temperature = (157°C + 161°C) – 277.5°C = 40.5°C Hence, the correct answer is 40.5°C.
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