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The average temperature for Wednesday, Thursday and Friday was 40°C. The average for Thursday, Friday and Saturday was 41° C. If temperature on Saturday was 42° C, what was the temperature on Wednesday?
  1. 39° C
  2. 44° C
  3. 38° C
  4. 41° C
Explanation

Average temperature for Wednesday, Thursday and Friday = 40° C

Total temperature = 3 × 40 = 120° C

Average temperature for Thursday, Friday and Saturday = 41° C

Total temperature = 41 × 3 = 123° C

Temperature on Saturday = 42° C

Now,

(Thursday + Friday + Saturday) - (Wednesday + Thursday + Friday) = 123 - 120;

Saturday - Wednesday = 3

Wednesday = 42 - 3 = 39° C

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