first determine the weight of the child in kg
1 lb = 0.45 kg
80 lb = y kg ( let y be the weight in kg
80 x 0.45 = 1 x y
to solve for y , divide both sides by 1
y = 80 x 0.45/ 1 =36 kg
find dosage now since we have the weight of the child
1 kg = 2.5 milligrams
36 kg = ? milligrams
(36 x 2.5)/1 = 90
let me know if i have helped you my friend.
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