Each hour contains 60 minutes, so after 2 hours he took 2*60 = <<2*60=120>>120 minutes.

If each question takes two minutes, then he answered 120/2 = <<120/2=60>>60 questions.

Unanswered questions is 100-60 = <<100-60=40>>40 questions

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Grayson has 100 questions on a test. He answers some of the questions for 2 hours, taking two minutes for each answer, then realizes he doesn't know the rest of the questions. How many questions does Grayson leave unanswered when he submits his test?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
40
Grayson has 100 questions on a test. He answers some of the questions for 2 hours, taking two minutes for each answer, then realizes he doesn't know the rest of the questions. How many questions does Grayson leave unanswered when he submits his test?
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