Jerome rides a total of 12 x 12 = <<12*12=144>>144 miles in 12 days.

So, he will ride 150 - 144 = <<150-144=6>>6 miles on the 13th day to finish his goal.

# Answer

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<|im_start|>system
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<|im_start|>user
Jerome is taking a 150-mile bicycle trip. He wants to ride 12 miles for 12 days. How long will he ride on the 13th day to finish his goal?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
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Jerome is taking a 150-mile bicycle trip. He wants to ride 12 miles for 12 days. How long will he ride on the 13th day to finish his goal?
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