Math Fun Library

Question :
Why is number 99 called doctor's number ?

Answer :
For a doctor the number 99 is very important, because when he listens to the chest of a patient through Stethoscope, he asks the patient to say repeatedly ninty nine. The normal resonance this vocalisation would cause is increased if the underlined lung has solidified or became pneumonic.
In other words vocalisation of nintey nine helps the doctor to diagnose pneumonia at the bedside.
If you have ninety nine sounding louder than the normal in a particular area you know that the lung in that area has become solidified or pneumonic.
Pneumonia is the commonest cause of ninety nine becoming louder in any area of the lung.