Answer:
Constant of proportionality, k = 21
Step-by-step explanation:
We are given the following in the question:
The amount of flour required is directly proportional to the number loaf of breads made.
Let w be the weight of flour and n be the number of loaf of breads.
Thus, we can write,

where k is the constant of proportionality.
21 ounces of flour is required to make 1 loaf of bread.
Putting these values, we get,

Thus, the equation giving relation between weight of bread and number of loafs of bread is

The probability would be 0.56.
Conditional probability is given as:
P(A and B) = P(A) * P(B|A). In this case, we have
P(E and F) = P(E) * P(E|F) = 0.7(0.8) = 0.56.