The average temperature of a city for the first four days of the week is 25°C, and the
average temperature for the last four days is 30°C. If the average temperature for the
entire week is 27°C, then what is the temperature on the fourth day?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 31°C.
Sum of the temperature of the first four days = 25 × 4 = 100....(1)
Sum of the temperature of the last four days = 30 × 4 = 120....(2)
Sum of the temperature of the entire week = 27 × 7 = 189....(3)
Add equations 1 and 2 and subtract equation 3
Temperature of the fourth day = (100 + 120) - 189 = 220 - 189 = 31°C