Now the question has described the formula of Body Mass Index (BMI) as:
BMI[tex]=\frac{w}{h^2} \times 703[/tex]
Where 'w' is weight in pounds and 'h' is the height of the person in inches.
We need to find the weight of a 13 year old boy whose height is 60 inches and the BMI value of his body is 20.5.
Now, we have [tex]h=60[/tex], [tex]BMI=20.5[/tex]
Plugging the values in the formula of BMI we get:
[tex]20.5=\frac{w}{(60)^2}\times 703[/tex]
Solving for 'w' we get:
[tex]w=\frac{20.5\times (60)^2}{703} =104.97\approx105[/tex]
Hence, the weight of 13 year old boy is 105 pounds.
