On 3 August to 6 August, an average of 49 croissants were sold and from 7th August to 11 August, an average of 28 croissants were sold. $220 worth of croissants were sold from 12 August to 22 August. Given that a croissant was sold for $5, find the average number of croissants sold from 3 August to 22 August.
Number of croissants sold from 12 August to 22 August
= 220 ÷ 5
= 44

Number of days from 3 August to 6 August
= 6 - 3 + 1
= 4

Number of days from 7 August to 11 of August
= 11 - 7 + 1
= 5

Total number of croissants sold
= (4 x 49) + (5 x 28) + 44
= 196 + 140 + 44
= 380

Number of days from 3 August to 22 August
= 22 - 3 + 1
= 20

Average number of croissants sold
= 380 ÷ 20
= 19

Answer(s): 19