The number of flowers in Peter’s garden is 20 * 3 = <<20*3=60>>60 flowers.

The number of flowers left after he gave his brother 15 flowers is 60 – 15 = <<60-15=45>>45 flowers.

# Answer

45
<|im_start|>system
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<|im_start|>user
Amanda’s garden contains 20 flowers and Peter’s garden contains three times as many flowers as Amanda's. If Peter gave 15 flowers to his brother, how many flowers are left in his garden?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
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45
Amanda’s garden contains 20 flowers and Peter’s garden contains three times as many flowers as Amanda's. If Peter gave 15 flowers to his brother, how many flowers are left in his garden?
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