He bought 20+15=<<20+15=35>>35 cards

So he spent 35*2=$<<35*2=70>>70

# Answer

70
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
John buys thank you cards.  He decides to buy them for people who got him Christmas and birthday presents.  He sent 20 for Christmas gifts and 15 for birthday gifts.  If each card cost $2 how much did he spend on cards?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
70
John buys thank you cards.  He decides to buy them for people who got him Christmas and birthday presents.  He sent 20 for Christmas gifts and 15 for birthday gifts.  If each card cost $2 how much did he spend on cards?
train