+290 A man who weighed 220 pounds completed a diet-and-exercise program. After the 12-week program, his body fat percentage had dropped from 30% to 20%, and his eight had dropped to 200 pounds. If every part of his body that is not fat or muscle has a constant weight of 120 pounds, how many pounds of muscle did he gain during the program?
+37146 220 x 30 % = 66 pounds of fat initially and has 120 pounds of nonfat nonmuscle 220 - 66 -120 = 34 pounds of muscle etc
200 x 20 % = 40 pounds of fat plus 120 pounds of nonfat nonmuscle 200 - 40 - 120 = 40 pounds of muscle etc
40 - 34 = 6 pounds of muscle gained
