<human>:  Oliver had 135 stickers. He used 1/3 of his stickers, gave 2/5 of the remaining to his friend, and kept the remaining stickers. How many stickers did he keep?
<bot>: How many stickers did Oliver use? ** Oliver used 1/3 x 135 = <<1/3*135=45>>45 stickers.
How many stickers were remaining? ** So, there were 135 - 45 = <<135-45=90>>90 stickers remaining.
How many stickers did his friend receive? ** His friend received 2/5 x 90 = <<2/5*90=36>>36 stickers.
How many stickers did Oliver keep? ** Therefore, Oliver kept 90 - 36 = <<90-36=54>>54 stickers.
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