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

cross multiplication

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

cross multiplying,

(36 x 2.5)/1 = 90

=90

let me know if i have helped you my friend.

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