the average earning of a mechanic for the first-four days of a week is rs. 18

Question

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 ?

Options:

A . Rs. 20

B . Rs. 40

C . Rs. 60

D . Rs. 80

Answer: Option A
Explanation :

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