If Harry eats 6 grams of protein in 100 kcal of ME and the problem tells us that Harry's daily intake is 900 kcal, then we would have to multiply the amount of grams of protein in 100 kcal by 9 (since 900 kcal is 9 times 100 kcal)
Therefore, the total amount of grams Harry eats would be: 6 x 9 = 54 grams of protein.
