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:
1. 41°C
2. 42°C
3. 43°C
4. 40°C

Answer 1

Correct Answer - Option 4 : 40°C

Monday, Wednesday and Friday average temperature is 41 

Wednesday, Friday and Thursday average temperature is 42

⇒ M + W + F= 41 × 3= 123

⇒ W + F + TH = 42 × 3 = 126

Given part, Thursday temperature 43

Then (W + F + TH) - Thursday =

⇒ 126 - 43 = 83

⇒ Since (M + W + F) - (W + F) = Monday

⇒ 123 - 83 = 40 

So that Monday = 40 temperature