He ate 2 * 1 = <<2*1=2>>2 pounds of broccoli

There are 51 / 3 = <<51/3=17>>17 calories in each pound of broccoli

So he ate 2 * 17 = <<2*17=34>>34 calories of broccoli

He ate 1 * 51 = <<1*51=51>>51 calories of carrots

So in total he ate 51 + 34 = <<51+34=85>>85 calories

# Answer

85
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Tom eats a pound of carrots and twice as much broccoli.  If carrots have 51 calories per pound and broccoli has 1/3 that many calories, how many calories did he eat in total?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
85
Tom eats a pound of carrots and twice as much broccoli.  If carrots have 51 calories per pound and broccoli has 1/3 that many calories, how many calories did he eat in total?
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