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Assuming you mean 8 grams of protein...

carbohydrates: 20x4cal= 80

protein: 8x4cal= 32

fat: 5x9cal= 45

80+32+45= 157 calories.

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Q: How many calories are in a food that have 20 grams of carbohydrates 8 grams and 5 grams of fat?
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