chemistry
posted by k .
Chloroquine is used to treat malaria. Studies have shown that an effective dose for children is 3.5 mg per kilogram (3.5 mg/kg) of body weight, every 6 hours. If a child weighs 21 kg, how many milligrams of this drug should be given in a 66 hour period?

3.5 mg/kg x 21 kg = ? mg drug every 6 hours. Then ?mg/6 hrs x 66 hours = x total in 66 hours.