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 . 6 on the fourth day, his average earning for the whole week is ?	Choose the correct choice from the following.
A) Rs . 18.95
B) Rs 16
C) Rs. 22
D) Rs. 25.71
E) None of these
Answer   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 - 6   = Rs. 154   âˆ´ Average earning = 154 / 7   = Rs. 22   Rs. 22orrect Option: Rs. 22
<result>C</result>
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 . 6 on the fourth day, his average earning for the whole week is ?