Question

The mean temperature for the first 4 days in January was -12°C.

The mean temperature for the first 5 days in January was -13°C.
What was the temperature on the 5th day?

Answer 1

-17

Explanation:

Given

The mean temperature for the first 4 days = -12°C

The mean temperature for the first 5 days = -13°C

To find

The temperature on the 5th day

Solution

Total of 4 days = 4*(-12) = -48°C

Total of 5 days = 5*(-13) = -65°C

The difference is the temperature on the 5th day:

-65 - (-48) = -17°C

Answer 2

• -17

Explanation:

Given

• The mean temperature for the first 4 days = -12°C
• The mean temperature for the first 5 days = -13°C

To find

• The temperature on the 5th day

Solution

• Total of 4 days = 4*(-12) = -48°C
• Total of 5 days = 5*(-13) = -65°C

The difference is the temperature on the 5th day:

• -65 - (-48) = -17°C