Let x : Number of persons reading only Anandbazar
y : Number of persons reading only Ganashakti
z : Number of persons reading both
Hence ,
x + 2y + z = 65
x + y + z = 52
==> y = 13
Hence ,
x + z = 52 - 13
= 39
Hence , number of persons reading only 1 newspaper in Aghosh Colony = 39