require 'pp'
@hash_val = Hash.new {|h, k| h[k] = [] }

def set_hash class_name , name , age
    @hash_val[class_name] << {
        :name => name,
        :age => age
    }
end

set_hash('b-16','Penny',26)
set_hash('b-16','Leonard',28)
set_hash('b-17','Sheldon',39)

pp @hash_val