How much is it for thirteen children to drink compound paracetamol dextromethorphan syrup?

Compound paracetamol and methadone syrup is used for fever, headache, limb aches, sneezing and runny nose, stuffy nose, cough and sore throat caused by common cold or influenza. When taking this medicine, it depends on age and weight. Thirteen children generally weigh 60-80 kg, taking 6.5 ml once, three times a day.