Last year, 5 companies had an average of 16 non working

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Last year, 5 companies had an average of 16 non working days each. This year, 3 companies had 10 more non working days each, and 2 companies had 5 fewer non working days each. What was the average number of non working days given by the same companies this year ?

1. 12 .
2. 18
3. 20
4. 22

Correct Option: C

Here , The average of 5 companies non working days = 16
Number of non-working days last year = 5 × 16 = 80
According to question ,
Number of non-working days this year = 80 + 3 × 10 – 2 × 5 = 100
∴ Required average = 100 &divivde; 5 = 20