Matrix Solution

a = [[1,2,4,5],[6,7,8,9],[10,11,12,13],[14,15,16,17]]

def get_position(a,num)
  length = a.length-1
  (0..a.length).each do |i|
    if a[i][a.length-1] >= num
      (0..a.length).each do |j|
        if a[i][j] == num
            return i, j
        end
      end
    end
  end
end

val = 14
position = get_position(a,val)
puts "The position of #{val} is #{position}"

Music Player

def sort(songs):
  i = 0
  music = songs[i][1]
  for music in range(len(songs)-1,0,-1):
    for i in range(music):
      if songs[i][1]>songs[i+1][1]:
          temp = songs[i]
          songs[i] = songs[i+1]
          songs[i+1] = temp
  return songs

def play_list(songs, time):
	songs = music_sort(songs)
	playtime = 0
	play_list = []
	i = 0
	while i < len(songs)-1:
		playtime = playtime + songs[i][1]
		if playtime <= time:
			play_list.append(songs[i])
		else:
			break
		i += 1
	return play_list


songs = [('winnie',1),('charles',2),('Joseph',8),('melody',3),('linkinpark',7),('alpha male',5),('pink',2),('goldberg',4)]
time = 0
print(play_list(songs, 150))