On 6 November to 9 November, an average of 52 sandwiches were sold and from 10th November to 14 November, an average of 30 sandwiches were sold. $324 worth of sandwiches were sold from 15 November to 25 November. Given that a sandwich was sold for $2, find the average number of sandwiches sold from 6 November to 25 November.
Number of sandwiches sold from 15 November to 25 November
= 324 ÷ 2
= 162

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 sandwiches sold
= (4 x 52) + (5 x 30) + 162
= 208 + 150 + 162
= 520

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

Average number of sandwiches sold
= 520 ÷ 20
= 26

Answer(s): 26