Body- mass index, or BMI, takes both weight and height into
account when assessing whether an individual is underweight or
overweight. BMI varies directly as one's weight, in pounds, and
inversely as the square of one's height, in inches. In adults,
normal values for the BMI are between 20 and 25. A person who
weighs 189 pounds and is 69 inches tall has a BMI of 27.91. What is
the BMI, to the nearest tenth, for a person who weighs 138 pounds
and who is 65 inches tall?