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:

• A. 41°C
• B. 42°C
• C. 43°C
• D. 40°C

Answer 1

Answer:

D. 40°C

Solution: Formula used: Average = Sum of observations ÷ Number of observations Calculation: Average temperature on Monday, Wednesday, and Friday is 41°C ⇒ M + W + F = 41 × 3 = 123 -----(1) Average temperature on Wednesday, Friday, and Thursday is 42°C ⇒ W + F + T = 42 × 3 = 126 -----(2) According to the question, Temperature on Thursday = 43°C ⇒ W + F = 126 - 43 = 83 [From Equation(2)] ⇒ M + 83 = 123 [From Equation(1)] ⇒ M = 123 -83 = 40 ∴ The temperature on Monday is 40°C.