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  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
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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