 
 <translate> Oliver used 1 / 3 x 135 = 45 stickers. So, there were 135 - 45 = 90 stickers remaining. His friend received 2 / 5 x 90 = 36 stickers. Therefore, Oliver kept 90 - 36 = 54 stickers.
Thus, the answer is 54. <hau> Oliver ya yi amfani da 1 / 3 x 135 = 45 stickers. Don haka, akwai 135 - 45 = 90 da suka rage. Abokinsa ya karɓi 2 / 5 x 90 = 36 lambobi. Saboda haka, Oliver ya kiyaye 90 - 36 = 54 lambobi. Saboda haka, amsar ita ce 54. 