On 2 September to 5 September, an average of 40 lemons were sold and from 6th September to 10 September, an average of 24 lemons were sold. $300 worth of lemons were sold from 11 September to 21 September. Given that a lemon was sold for $5, find the average number of lemons sold from 2 September to 21 September.
Number of lemons sold from 11 September to 21 September
= 300 ÷ 5
= 60

Number of days from 2 September to 5 September
= 5 - 2 + 1
= 4

Number of days from 6 September to 10 of September
= 10 - 6 + 1
= 5

Total number of lemons sold
= (4 x 40) + (5 x 24) + 60
= 160 + 120 + 60
= 340

Number of days from 2 September to 21 September
= 21 - 2 + 1
= 20

Average number of lemons sold
= 340 ÷ 20
= 17

Answer(s): 17