Question

During your workout each day you spend a total of60 minutes jogging and swimming. You burn 15calories per minute when jogging and 10 caloriesper minute swimming Let j represent in minutes)the amount of time spent jogging and write avariable expression ( in terms of )) that can be usedto determine the number of calories burned. Thenuse your expression to determine the number ofcalories burned if you jog for 20 minutes.

Answer 1

We represent with the letter "j" the time spent jogging.

We represnt with the letter "s" the time swiming.

And we need to write a mathematical expression that represents the number of calories burn while exercising.

we know as well that when jogging one burns 15 calories per minute and when swiming one burns 10 calories per minute.

Our equation for number of calolries burnt is;

calories = 15 * j + 10 * s

(where j and s are to be entered in minutes)

so when the person jogs for 20 minutes (and no swiming)

calories = 15 (20) + 10 (0) = 300 + 0 = 300 calories.