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Question

The population of a village was decreasing every year due to migration, poverty and unemployment. The present population of the village is 3,15,840.last year the migration rate was 4%and the before year was 6%. What was the population two years ago 
 


Solution

See , the population is decreasing in an A.P. , as the 2nd last year , it was 6% of the total , and the last year it was 4% of the total , then , 
this year the population will be 2% of the total .
so , 2% of the total population is 3,15,840.
so ,100% will be ,
3,15,840 * 50
so ,the population 2 years ago was 8% according to the A.P. , 
so as the total population is known ,  then 8% of total population will be , 
50 * 3,15,840 * 8/100
4 * 3,15,840
12,64,800 people.

Mathematics

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