Since one 12-ounce can of soda has 150 calories, the big 28-ounce size would contain more calories. To calculate the number of calories in the 28-ounce size, you can use proportions:
Let "x" be the number of calories in a 28-ounce soda can
Proportion: 12 oz : 150 calories = 28 oz : x
Solving for "x":
x = (28 oz x 150 calories) / 12 oz
x = 350 calories
Therefore, Josiah would get 350 calories if he drinks the big 28-ounce size soda from the local mini-mart.