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23 votes
23 votes
Eleanor is on a diet. She has decided to limit her calorie intake to 2000 calories per day, and she enrolled in an aerobics class in order to get some extra exercise. She read that aerobics burns 400 calories each hour.

Today for breakfast and lunch combined, she consumed 1300 calories; however, it was her boss' birthday, so they celebrated at work with an ice cream cake. The slice of cake she ate had 655 calories. Then, for dinner, she had 3 pieces of leftover pizza at 285 calories per piece. Calculate how many extra calories she consumed to determine how long she should stay at aerobics to burn off the extra calories. Show your work.

User Lova Chittumuri
by
2.6k points

2 Answers

18 votes
18 votes

Final answer:

Eleanor consumed a total of 2810 calories in a day and needs to burn off 810 extra calories. Aerobics burns 400 calories per hour, so she would need approximately 2 hours and 2 minutes of aerobics to burn the extra calories.

Step-by-step explanation:

The question involves calculating how many extra calories Eleanor consumed compared to her limit and how long she should exercise in aerobics class to burn off these extra calories. Eleanor had a total calorie intake of 1300 calories from breakfast and lunch combined, 655 calories from a slice of ice cream cake, and 855 calories from three pieces of pizza (3 x 285 calories per piece).

First, we calculate the total calorie intake for the day:
1300 calories (breakfast and lunch) + 655 calories (cake) + 855 calories (pizza) = 2810 calories.

By subtracting the maximum calorie intake limit Eleanor set for herself, we can find the excess calories:
2810 total calories - 2000 limit = 810 extra calories.

Knowing that aerobics burns 400 calories each hour, we calculate the time needed to burn the extra 810 calories:
810 extra calories / 400 calories per hour = 2.025 hours.

Since we typically don't measure exercise time in fractions of an hour, Eleanor would need to spend roughly 2 hours and 2 minutes doing aerobics to burn off the extra 810 calories.


User Harishr
by
2.9k points
10 votes
10 votes

Answer:

2 1/40 hours = 2.025 hours

Step-by-step explanation:

1300 + 655 + 285 x 3 = 2810 calories

2810 - 2000 = 810 calories

810 / 400 = 2 1/40 hours

User Vikesh
by
2.9k points
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