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 step by step below.
30
The second dose had a wait time of 20 / 2 = 10 minutes.

So the total wait time is 20 + 10 = 30 minutes.

.

The answer: 30