He burns 2300-1800=<<2300-1800=500>>500 calories a day

He needs to burn 4000*10=<<4000*10=40000>>40,000 calories to hit his goal

That means it will take him 40,000/500=<<40000/500=80>>80 days

# Answer

80
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
John wants to lose weight.  He eats 1800 calories a day and burns 2300 a day.  If he needs to burn 4000 calories to lose 1 pound how many days will it take to lose 10 pounds?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
80
John wants to lose weight.  He eats 1800 calories a day and burns 2300 a day.  If he needs to burn 4000 calories to lose 1 pound how many days will it take to lose 10 pounds?
train