Tyler has 21 CDs. He gives away a third of his CDs to his friend. Then he goes to the music store and buys 8 brand new CDs. How many CDs does Tyler have now?
Tyler gives away 21 / 3 = <<21/3=7>>7 CDs
After giving away a third of his CDs, Tyler has 21 - 7 = <<21-7=14>>14 CDs
After buying new CDs, Tyler has 14 + 8 = <<14+8=22>>22 CDs
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