None but the rich ran afford air-travel

Examine the following statements:

  1. None but the rich ran afford air-travel.
  2. Some of those who travel by air become sick.
  3. Some of those who become sick require treatment.

Which one of the following conclusions can be drawn from the above statements?

  1. All the rich persons become sick.
  2. All those who travel by air are rich.
  3. Those who travel by air become sick.
  4. All the rich persons travel by air.

Answer

Only statement 1 is definitive. Only rich can afford air-travel, so all those travelling by air must be rich.

The correct option is B.