Answer:
Randy can make 84 snow cones
Explanation:
First, it is necessary to calculate the total pounds that Randy has. It can be calculated as:
28 pound * 2 Blocks of ice = 56 pounds of ice
Then, we need to use a rule of three in which we know that each snow cone requires 2/3 pound of ice, then with 56 pounds how many snow cones can be made. This is:
1 snow cone -------------------- 2/3 pound of ice
x -------------------- 56 pounds of ice
Where x is the number of snow cones that can be made with 56 pounds of ice. Solving for x, we get:

x = 84 snow cones.
So, Randy can make 84 snow cones.