The average temperature for Monday, Wednesday and Friday was 41°C. The average for Wednesday, Friday and Thrusday was 42°C. If the temperature on Thrusday was 43°C,then the temperature on Monday was:
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 40°C.
The sum of temperature on Monday, Wednesday, and Friday
⇒ 41 × 3 = 123°C.......(1)
The sum of temperature on Wednesday, Friday, and Thursday
⇒ 42 × 3 = 126°C.......(1)
According to the question
The temperature on Thursday was 43°C
⇒ W + F = 126 - 43 = 83 [From eq 2]
⇒ M + 83 = 123
⇒ M = 123 - 83
⇒ M = 40°C
Thus, the temperature on Monday is 40°C