[b]Working yield =[/b] number of liters of strawberries that a worker is required to pick per day

[b]Target question =>[/b] How many workers must the farmers hire to pick the entire expected crop of strawberries in 15 calendar days

[b]Statement 1 =>[/b] A workday yield is 45 liters
1 worker is expected to pick 45 liters of strawberries per day. Since the total quantity expected is unknown, we cannot evaluate the average quantity per day for a particular number of workers. Hence, statement 1 is NOT SUFFICIENT

[b]Statement 2 =>[/b] The expected crop is 13500 liters
For a period of 15 calendar days, the average quantity per day = 13500/15 = 900 liters per day but the workday yield of a worker is unknown so the total workers needed to produce 900 liters per day is unknown. Statement 2 is NOT SUFFICIENT

[b]Combining both statements together =>
From statement 1 =>[/b] workday yield = 45 liters
[b]From statement 2 => [/b]Average quantity per day = 900 liters
So, if 1 worker picks 45 liters
x worker will pick 900 liter
x = 900/45 = 20
The farmer is expected to have 20 workers to produce 900 liters per day and 13500 liters in 15 calendar days.
Both statements combined together ARE SUFFICIENT

[b]Answer = C[/b]