The cellular respiration of different foods produces different amounts of water: 1 .0 g of glucose (carbohydrate) results in 0.6 g of water.

1.0 g of fat results in 1.07 g of water.

1.0 g of protein produces 0.4 g of water.

a) assume that grain is two percent fat, 62 percent carbohydrate, 11 percent protein, and 10.4 percent free water. For how many days could the kangaroo rat's water be met by 1 kg of grain?

b) Assume that a cooked beef steak is seven percent fat, 27 percent protein, and 65.6 percent free water. For how many days could a human's water needs be met by 1 kg of beef?