Calculating % of water and energy content

I'm not sure if the Math Help Forum is the right place to ask these questions but I'm desperate. :o

I have a lab due tomorrow and I have no idea how to answer these questions:

1. 2.0 oz of spaghetti (56 g) has 200 kcal and contains 7 g of protein. It has essentially no fat. Both carbohydrates and proteins provide about 4.0 kcal/g. Calculate the percentage of water in spaghetti.

2. Brown eggs sold by Trader Joe's each weigh 56 g and contain 5 g fat, 1 g of carbohydrates and 7 g protein. Calorie content of fats, carbs and proteins are respectively 9, 4, and 4 kcal/g. Calculate the energy content of a single brown egg.

3. A typical low fat 4.0 oz sample of hamburger meat provides 245 kcal and has 17 g fat. Calculate the percentage of water in this hamburger meat.

Thanks.