Jim is a college wrestler weighing 145 lbf and he decides to wrestle in the 132 lbf weight class for the upcoming season. He plans to start his weight-loss program early so that he can be down to the desired weight by the first practice of the season. To accomplish this, he restricts his food intake to 1000. Calories per day and begins an exercise program consisting of jogging for 20.0 min a day plus 10.0 min of other daily exercises that are equivalent to climbing 20 flights of stairs at 12.0 ft per flight. When he is not exercising, his average energy expenditure rate is 500. Btu/h for the remainder of the 24 h day.
a. What is Jim's total energy expenditure during his 30.0 min workout?
b. Assuming his excess weight is all body fat, how many days before his first wrestling practice must he start the program?