Question

The mean temperature for the first 4 days in January was -3°C.

The mean temperature for the first 5 days in January was -2°C.
What was the temperature on the 5th day?

Answer 1

2°C

Explanation:

5 × ( - 2 ) - 4 × ( - 3 ) = - 10 + 12 = 2

The temperature on the 5th day is 2°C .