A rational number is a number that can be expressed as a fraction of two whole numbers, like 3/1 (3), 8/10 (0.8), or even something crazy like 23784/924433 (0.0257...). ... For example, pi and the square root of two cannot be expressed as a fraction of two whole numbers, so they are both irrational.
1 cup is equal to 8 oz, so 3 cups x 8 = 24 oz. you'll do the same for the two cups 2 x 8 = 16 oz so adding them all together will be 24 + 6 + 16 + 9 = 55 total oz.
