The first question is more complicated, asking about the percentage of protein, fat and carbohydrate in the four foods.

(1) Beef: protein 20. 1% fat 10.2% carbohydrate 0. 1%.

Fish and shrimp: protein 17.6% fat 0.8% carbohydrate 0.2%.

Vegetables: protein 2.6% fat 0.4% carbohydrate 2.0%.

Noodles: protein 10.5% fat 1.6% carbohydrate 73.0%.

(2)20. 1%— 17.6%=2.5%

(3)0.2%—0. 1%=0. 1%

(4) 1.6%—0.8%=0.8%