Explanation:
number of female doctors that year = 53,400
as a percentage of the total no of docors =31.9%
31.9%------->53,400
so 1%-------->53,400/31.9
so the rest of percentage must be the no of male docors..... so (100-31.9) % = 68.1%
so 68.1%----------> (53,400/31.9)×68.1
so total no of docors= [(53,400/31.9)×68.1]+53,400
= 167398.1
or
31.9%------->53,400
so 1%-------->53,400/31.9
100%-------->(53400/31.9 )×100
so total no of docors = (53400/31.9 )×100
~ approximately 167398 doctors