The population of a town increases at the rate of 40 per thousand annually. If the present population be 175760, what was the population three years ago.
Given,
Increase rate of population of town = 
Present population of town = 175760
Let population of town 3 years ago was = X
So,
= 
= 
= 
Hence,
Population of town 3 years ago was = 156250
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