Final answer:
Jane consumed 340 calories from carbohydrates at breakfast, calculated by multiplying the amount of CHO (85 grams) by the calorie content per gram of CHO (4 calories/gram).
Step-by-step explanation:
Jane consumed a breakfast consisting of 85 grams of carbohydrates (CHO). To calculate the number of calories from carbohydrates, we use the fact that carbohydrates provide approximately 4 calories per gram. Therefore, the calories from carbohydrates are calculated as:
85 grams CHO × 4 calories/gram = 340 calories
So, Jane consumed 340 calories from carbohydrates at breakfast.