We were told that the weight of the individual is 139 pounds. 13.4 percent of this weight is body fat. Recall, percentage is expressed in terms of 100. Thus, the number of pounds of her weight is made up of fat is
13.4/100 x 139
= 18.626
Rounding to the nearest tenth, the number of pounds of her weight is made up of fat is 18.6 pounds