On 1 November to 4 November, an average of 54 chikoos were sold and from 5th November to 9 November, an average of 27 chikoos were sold. $218 worth of chikoos were sold from 10 November to 20 November. Given that a chikoo was sold for $2, find the average number of chikoos sold from 1 November to 20 November.
Number of chikoos sold from 10 November to 20 November
= 218 ÷ 2
= 109

Number of days from 1 November to 4 November
= 4 - 1 + 1
= 4

Number of days from 5 November to 9 of November
= 9 - 5 + 1
= 5

Total number of chikoos sold
= (4 x 54) + (5 x 27) + 109
= 216 + 135 + 109
= 460

Number of days from 1 November to 20 November
= 20 - 1 + 1
= 20

Average number of chikoos sold
= 460 ÷ 20
= 23

Answer(s): 23