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The average temperature on Monday, Tuesday and Wednesday is 40°C. Tuesday, Wednesday and Thursday have an average temperature of 41°C. If Thursday's temperature was 42°C, what was the temperature on Monday?
1. 30°C
2. 33°C
3. 36°C
4. 39°C

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Correct Answer - Option 4 : 39°C

Given:

The average temperature on Monday, Tuesday and Wednesday = 40°C 

Temperature of Tuesday, Wednesday and Thursday = 41°C 

Temperature of Thursday = 42°C

Formula used: 

Mean = Sum of no. observation/No. of observation 

Calculation:

Average temperature for Monday, Tuesday and Wednesday = 40°C

Total temperature = 3 × 40 = 120°C

Average temperature for Tuesday, Wednesday and Thursday = 41°C

Total temperature = 41 × 3 = 123°C

Temperature on Thursday = 42°C

⇒ (Tuesday + Wednesday + Thursday) - (Monday + Tuesday + Wednesday) = 123° - 120° 

Thursday - Monday = 3° 

Monday = 42° - 3° = 39°C

∴ The temperature on Monday is 39°C.

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