Jill burns 100 calories per hour while sleep and 300 calories per hour while walking and 200 calories per hour at work. If in a typical day Jill spends 7 hours sleeping, 2 hours walking and 6 hours working, what is her average calories burned for those hours?
166.67 cal/hr
200 cal/hr
133.3 cal/hr
233.67 cal/hr
I got 140 cal/hr... how do I do this problem?
(100*7 + 300*2 + 200*6)/15 = 166.67
It always helps if you show your own work - then it's possible to point out the mistake, if any.
To calculate Jill's average calories burned for those hours, you need to find the total calories burned for each activity and divide it by the total number of hours.
Let's calculate the calories burned during each activity:
- During sleep, Jill burns 100 calories per hour and sleeps for 7 hours, so she burns 100 calories/hour * 7 hours = 700 calories.
- While walking, Jill burns 300 calories per hour and walks for 2 hours, so she burns 300 calories/hour * 2 hours = 600 calories.
- At work, Jill burns 200 calories per hour and works for 6 hours, so she burns 200 calories/hour * 6 hours = 1,200 calories.
Now let's calculate the total calories burned for all activities:
- Total calories burned = calories burned while sleeping + calories burned while walking + calories burned at work
= 700 calories + 600 calories + 1,200 calories = 2,500 calories
Lastly, divide the total calories burned by the total number of hours:
- Average calories burned = Total calories burned / Total number of hours
= 2,500 calories / (7 hours + 2 hours + 6 hours) = 2,500 calories / 15 hours = 166.67 calories per hour.
Therefore, the correct answer is 166.67 cal/hr.
To calculate Jill's average calories burned per hour for those hours, you need to find the total number of calories burned and divide it by the total number of hours.
First, calculate the total calories burned during each activity:
- Sleeping: 100 calories/hour * 7 hours = 700 calories
- Walking: 300 calories/hour * 2 hours = 600 calories
- Working: 200 calories/hour * 6 hours = 1200 calories
Next, find the total number of hours:
- Sleeping: 7 hours
- Walking: 2 hours
- Working: 6 hours
Now, add up the total calories burned during each activity:
700 calories + 600 calories + 1200 calories = 2500 calories
Finally, divide the total calories burned (2500 calories) by the total number of hours (7 hours + 2 hours + 6 hours = 15 hours) to get the average calories burned per hour:
2500 calories / 15 hours ≈ 166.67 calories/hour
Therefore, the correct answer is 166.67 cal/hr.