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# Ratios and Porportions - Calories

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Activity Cal/h Activity Cal/h
Bicycling 6 mi/h 240 Running 10 mi/h 1,280
Bicycling 12 mi/h 410 Swimming 25 yd/min 275
Cross-country skiing 700 Swimming 50 yd/min 500
Jogging 5 mi/h 740 Tennis (singles) 400
Jogging 7 mi/h 920 Walking 2 mi/h 240
Jumping rope 750 Walking 3 mi/h 320
Running in place 650 Walking 4 mi/h 440

Work with your group members to solve the following problems. You may find that
setting up proportions is helpful.
For problems 1 through 4, assume a 150-pound person.
1. If a person jogs at a rate of 5 mi/h for 3 h in a week, how many calories do they
burn?
2. If a person runs in place for 15 minutes, how many calories will be burned?
3. Ifapersoncross-countryskis for35minutes,howmanycalories willbeburned?
4. How many hours would a person have to jump rope in order to lose 1 pound? (Assume
calorie consumption is just enough to maintain weight, with no activity.)
Heavier people burn more calories (for the same activity), and lighter people burn
fewer. In fact, you can calculate similar figures for burning calories by setting up the
appropriate proportion.
5. At what rate would a 120-pound person burn calories while bicycling at 12 mi/h?

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#### Solution Summary

The number of calories burnt in each case is calculated using the given information.

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