Question

Etymology. The origin of the name "Raiganj" is not exactly known, and is debated. Some say the name is linked to the royal family of Dinajpur whose surname was Rai. The widely accepted view is that the name originated from the abundance of rai sorshe (a special type of mustard) crops at this place from time immemorial.


hmmmm​

Answer 1

Hence the mean of 10, 20 ,30, 40 is 25.