9. Evaluate the number of workers

In a company of \(100\) workers, some come to the company either by train or auto or on foot. In precise, 46 of them come by train, 32 of them come by auto, 26 of them come on foot and \(15\) of them uses all the three modes of transport. Now, how many workers come to the company exactly by two modes of transport?

 

The number of workers who comes to the company using exactly two modes of transport: