The average temperature of the first three days is 27° C and that of the next three is 29° C . If the average of the whole week is 28.5° C, the temperature of the last day of the week is?

10.5° C
21° C
31.5° C
42° C

Correct Answer: 31.5° C

Explanation:

Temperature of last day = Sum of temperature of 7 days - sum of temperature of first 6 days.
= ( 7 x 28.5 ) - [( 3 x 27 ) + ( 3 x 29 )]
=31.5
∴ Temperature of last day = 31.5

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