Question

The average earnings 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 earnings for the whole week is:

• A. Rs. 18.95
• B. Rs. 16
• C. Rs. 20
• D. Rs. 25.71
• E. None of these

Answer 1

The correct option is C Rs. 20

Total earnings for the week
$=Rs(4\times 18+4\times 22-20)=Rs.140$
$\therefore$ Average earnings $=Rs.\frac{140}{7}$ = Rs. 20.