Twice the distance Amy biked yesterday is 12*2 = <<12*2=24>>24 miles

If Amy biked 3 miles less than twice as far as yesterday, she biked 24-3 = <<24-3=21>>21 miles today.

The total distance she biked in the two days is 21+12 = <<21+12=33>>33 miles

# Answer

33
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Amy biked 12 miles yesterday. If she biked 3 miles less than twice as far as yesterday, how many miles did she bike in total in the two days?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
33
Amy biked 12 miles yesterday. If she biked 3 miles less than twice as far as yesterday, how many miles did she bike in total in the two days?
train