On 4 November to 7 November, an average of 41 pears were sold and from 8th November to 12 November, an average of 21 pears were sold. $213 worth of pears were sold from 13 November to 23 November. Given that a pear was sold for $3, find the average number of pears sold from 4 November to 23 November.
Number of pears sold from 13 November to 23 November
= 213 ÷ 3
= 71

Number of days from 4 November to 7 November
= 7 - 4 + 1
= 4

Number of days from 8 November to 12 of November
= 12 - 8 + 1
= 5

Total number of pears sold
= (4 x 41) + (5 x 21) + 71
= 164 + 105 + 71
= 340

Number of days from 4 November to 23 November
= 23 - 4 + 1
= 20

Average number of pears sold
= 340 ÷ 20
= 17

Answer(s): 17