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    Approximately 7% of body weight an average adult body with a weight of 150 to 180 pounds will contain approximately 4.7 to 5.5 litres of blood..
        
    
    
        
    An average adult body with a weight of 150 to 180 pounds will contain approximately 4.7 to 5.5 liters (1.2 to 1.5 gallons) of blood.