The average temperature of the first three days of the week is 25° C and that of the next three days is 27° C If the average ofthe whole week is 26.5° C, then the temperature of the last week of the week is

31.5° C
29.5° C
21° C
27.5° C

Correct Answer: 29.5° C

Explanation:

Let the temperature on the last day of the week be x° C
Average of the week = ( 3 x 25 + 3 x 27 + x ) / 7 = 26.5
⇒ 3 x 25 + 3 x 27 + x = 7 x 26.5
⇒ 156+ x = 185.5
∴ x = 29.5
So, the temprature on the last day of the week is 29.5° C

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