Two new logic puzzle from Danet, here’s the today one:

You are on a strict medical regimen that requires you to take two
types of pills each day. You must take exactly one A pill and exactly
one B pill at the same time. The pills are very expensive, and you
don’t want to waste any. So you open the bottle of A pills, and tap one
out into your hand. Then you open the bottle of B pills and do the same
thing — but you make a mistake, and two B pills come out into your
hand with the A pill. But the pills are all exactly identical. There is
no way to tell A pills apart from B pills. How can you satisfy your
regimen and take exactly one of each pill at the same time, without
wasting any pills?