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°C

B. 25.2°C

C. 25.6°C

D. 25.5°C

Show Answer

Answer-C
Solution-

Solution(By Apex Team)

According to the question, ⇒ Total temperature of first four days Mon + Tue + Wed + Thu = 25 × 4 = 100°C…..(i) ⇒ Total temperature of last four days Thu + Fri + Sat + Sun = 25.5 × 4 = 102°C …..(ii) ⇒ Total temperature of week = 25.2 × 7 = 176.4°C …..(iii) After adding equation (i) + (ii) Mon + Tue + Wed + 2 × Thu + Fri + Sat + Sun = 100° + 102° = 202°C…..(iv) After subtracting equation (iv) – (iii) = 202° – 176.4° = 25.6° C ⇒ Temperature of 4th day = 25.6° C

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