Solving problem N4020 Bayesian probability theory

Solving problem N4020 Bayesian probability theory

4020. The number of trucks traveling along the highway on which the gas station stands is one of the cars driving along the same highway as 3: 3. The probability that the truck will refuel is 0.1, for a passenger car this probability is 0.2. A car drove up to the gas station for refueling. Find the probability that this is a truck.

Additional information:

Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)