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Discussion

  1. 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 ?
    1. 10.5° C
    2. 21° C
    3. 31.5° C
    4. 42° C
  1. Correct Option: C

    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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