An infant ibuprofen suspension contains 100 mg/5.0ml suspension. the recommended dose is 10 mg/kg body weight. how many milliliters of this suspension should be given to an infant weighing 25 lb ?

Converts the 25 lb to kg 

multiply the kilograms by the dose (10 mg/kg)

multiply the amount of ibuprofen by the conversion factor of the concentration of the suspension to calculate the mL

25 lb x  0.453592 kg/1lb=  "A kg"

A kg x 10 mg/kg = B mg

B mg x  5.0 mL/ 100 mg = "C mL of suspension"