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Answer:
the answer is 18,000
Step-by-step explanation:
If we imagine that the population of a year ago was = X
so,
the increase of population is = X+X×15/100
. . . .. . . = X+3X/20
= 23X/20
now,
according to the question,
23X/20=20700
or,23X=20700×20
or,X=414000/23
so,X=18000
so,the population of a year ago was 18,000