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Discussion

  1. The average earning of a mechanic for the first-four days of a week is Rs. 18 and for the last four days is Rs. 22. If he earns Rs . 20 on the fourth day, his average earning for the whole week is ?
    1. Rs . 18.95
    2. Rs 16
    3. Rs. 20
    4. Rs. 25.71
  1. Correct Option: C

    Total earning for the week = Sum of earning of first four days + Sum of earning of last four days - Earning of 4th day
    = 4 x18 + 4 x 22 -20
    = Rs. 140

    ∴ Average earning = 140 / 7
    = Rs. 20

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