There are many ways of doing the same things in Ruby. You can check if value is in the range by use of following methods,
14.between?(10,20) # true
(10..20).member?(14) # true
(10..20).include?(14) # true
But, I would suggest using between? rather than member? or include?
All number literals denote inclusive ranges.
You can find more about it on Ruby in Rails.