On 6 November to 9 November, an average of 43 cookies were sold and from 10th November to 14 November, an average of 27 cookies were sold. $266 worth of cookies were sold from 15 November to 25 November. Given that a cookie was sold for $2, find the average number of cookies sold from 6 November to 25 November.
Number of cookies sold from 15 November to 25 November
= 266 ÷ 2
= 133

Number of days from 6 November to 9 November
= 9 - 6 + 1
= 4

Number of days from 10 November to 14 of November
= 14 - 10 + 1
= 5

Total number of cookies sold
= (4 x 43) + (5 x 27) + 133
= 172 + 135 + 133
= 440

Number of days from 6 November to 25 November
= 25 - 6 + 1
= 20

Average number of cookies sold
= 440 ÷ 20
= 22

Answer(s): 22