The total amount of cookies he can eat in a day is 13 x 3 = <<13*3=39>>39.

The total amount of cookies he can eat in a month is 39 x 20 = <<39*20=780>>780.

Therefore, the total amount of cookies he can eat in 3 months is 780 x 3 = <<780*3=2340>>2340.

# Answer

2340
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Theo can eat 13 cookies, 3 times a day, 20 days each month. How many cookies can he eat in 3 months?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
2340
Theo can eat 13 cookies, 3 times a day, 20 days each month. How many cookies can he eat in 3 months?
train