If a bottle of beer has 15 grams of carbohydrate, 0 grams of fat, 1 gram of protein and 15 grams of alcohol, approximately how many calories does it contain?

Fat: 1 gram = 9 calories, Protein: 1 gram = 4 calories, Carbohydrates: 1 gram = 4 calories, Alcohol: 1 gram = 7 calories

From the question given above, a bottle of beer contains 15 grams of carbohydrate, 0 grams of fat, 1 gram of protein and 15 grams of alcohol.

15 g of carbohydrate = 15 x 4 = 60 calories

0 g of fat = 0 calories

1 g of protein = 1 x 4 = 4 calories

15 g of alcohol = 15 x 7 = 105 calories

60 + 0 + 4 + 105 = 169

Therefore a bottle of beer contains 169 calories.