John decides to get the vaccine for COVID. He has to wait 20 minutes for the first dose. The second dose has a wait time half as long. How long was the total wait time? Let's think first. Chain of thought:
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The second dose had a wait time of 20 / 2 = 10 minutes. So the total wait time is 20 + 10 = 30 minutes.
Therefore, the answer is 30.
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