Antonov was left with 60 - 20 = <<60-20=40>>40 pieces of candy.

Therefore, he still has 40 / 20 = <<40/20=2>>2 packs of candy.

# Answer

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<|im_start|>user
Antonov bought 60 candies. He gave a pack of candy to his sister. If a pack of candy has 20 pieces, how many packs does Antonov still have?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
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user
2
Antonov bought 60 candies. He gave a pack of candy to his sister. If a pack of candy has 20 pieces, how many packs does Antonov still have?
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