Alright, so we're going to be taking 200mg/kg and 76lbs as 2 starting points, and multiplying it by 1  (numbers where the numerator and denominator equal each other) , resulting in[tex] \frac{200mg}{1kg}  *  \frac{1kg}{2.20462lbs}  * 76lbs=  6531.74 mg[/tex] . The 1kg in the second number is on the top to cancel out the kg from before