Z varies directly with the product of x and y, when
x=2,y=0.5, z=4, so the function is z=

z = 4xy

Step-by-step explanation:

IF Z varies directly with the product of x and y, then;

Z = kxy

k is the proportionality constant

If x=2,y=0.5, z=4,

4 = k(2)(0.5)

4 = k * 2 * 1/2

4 = k

Swap

k = 4

Substitute into the original expression

z = kxy

z = 4xy

This gives the required expression

20

step-by-step explanation:

assuming you meant there are 24 pounds of apples in each case, if this is not what you meant, correct me so i can you further