###
**The mean high temperature of the first four days of a week is 25°C whereas the mean of the last four days is 25.5°C. If the mean of the whole week is 25.2°C, then the temperature of the 4th day is-
**

A. 25.2°C
B. 25.5°C
C. 25.6°C
D. 25°C
**Answer: Option C**

## Show Answer

Solution(By Apex Team)

Average temperature of first four days
= 25°C
Total temperature of first four days
= 25° × 4 = 100°C
Average temperature last four days
= 25.5°C
Total temperature of four days
= 25.5° × 4 = 102°C
Total temperature of whole week
= 25.2° × 7 = 176.4°C
∴ Temperature of the 4th day
= 100° + 102° – 176.4°
= 25.6°C

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