Nutritional tables give the potassium content of a standard apple (3 apples/lb) as 159 mg. how many grams of potassium are in 4.82 kg of apples?

To answer this question, you need to find how many apple (in number, not weight) you have.

Since there is 3 apples / lb and you have 4.82 kg of apples, then the number of apples you have is: 4.82 kg x 2.20462lb/kg x 3 apples/lb = 31.87 apples.

One apple equal to 159 mg of potassium, then all the apples should be: 31.87 apples x 159mg potassium/apple = 5067,3 mg of potassium