John has made $250 in 10 days, so this means he makes $250/10=<<250/10=25>>25 dollars a day.

Since John wants to make double his current amount, this means he wants to make 250*2=<<250*2=500>>500 dollars

This means John needs to work 500/25= <<500/25=20>>20 days in total to make 500.

As John has already worked 10 days, this means he needs to work 20-10=<<20-10=10>>10 more days to make his goal.

# Answer

10
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
John has started at a job he works every day 10 days ago.  So far, he's made $250.  How many more days must John work before he makes twice this amount, assuming he makes the same amount every day?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
10
John has started at a job he works every day 10 days ago.  So far, he's made $250.  How many more days must John work before he makes twice this amount, assuming he makes the same amount every day?
train