Question : The average temperature for Monday, Wednesday and Friday was 41°C. The average for Wednesday, Friday and Thursday was 42°C. If the temperature on Thursday was 43°C, then the temperature on Monday was:
Option 1: 43°C
Option 2: 41°C
Option 3: 42°C
Option 4: 40°C
Correct Answer: 40°C
Solution : The average temperature for Monday, Wednesday, and Friday = 41°C The sum of temperatures on Monday, Wednesday, and Friday = 41 × 3 = 123°C The average temperature for Wednesday, Friday, and Thursday = 42°C The sum of temperatures of Wednesday, Friday, and Thursday = 42 × 3 = 126°C The temperature on Thursday = 43°C The sum of temperatures on Wednesday and Friday = 126 – 43 = 83°C Temperature on Monday = 123 – 83 = 40°C Hence, the correct answer is 40°C.
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