\(\text{Amount of Food} = \frac{\text{Food Available}}{\text{Number of Chickens}}\)

\(\text{Food Available} = \text{Market Price } \times 0.1\)

So the Market Price indirectly determines the Amount of Food

class MarketPrice:
    def __init__(self):
        self.is_constant = False
        self.value = 1000

class FoodAvailable:
    def __init__(self): self.is_constant = False
    def compute(self):
        return MarketPrice().value * 0.1

class NumberOfChickens:
    def __init__(self):
        self.is_constant = True
        self.value = 5

class AmountOfFood:
    def __init__(self): self.is_constant = False
    def compute(self):
        return FoodAvailable().compute() / NumberOfChickens().value

Suppose as bellow

AmountOfFood().compute()

20.0