A personal trainer's workout recommendations are: 1/3 focus on cardiovascular fitness, 1/2 focus on strength training, remaining focus on stretching. According to this recommendation, approximately what percent of a person's workouts should focus on stretching? (Round your answer to the nearest whole percent.)

This choice is incorrect because it exceeds the total percentage of a workout (100%). The sum of the percentages recommended for cardiovascular fitness (33.33%), strength training (50%), and stretching cannot exceed 100%.

This choice is incorrect because it is far too high. After subtracting the percentage of time allocated to cardiovascular fitness (33.33%) and strength training (50%) from 100%, only 16.67% of the total workout time remains for stretching. Rounded to the nearest whole percent, this value is 17%, not 80%.

This choice is incorrect because it slightly overestimates the percentage of time that should be dedicated to stretching. After subtracting the time allocated to cardiovascular fitness and strength training from the total workout time, only 16.67% remains for stretching. When this is rounded to the nearest whole percent, the result is 17%, not 20%.