Here's a better math problem:
A college department has ordered 200 computers containing AMD and Intel processors for all of its computer labs, replacing all systems in the process. Only Dells and HPs were ordered. 87 of the computers are Dells, and of those 87, 50 use Intel processors. There are a total of 67 HP computers with Intel processors. If you walk into a random computer lab the department manages and sit at a random computer system, what is the probablility that it is an AMD powered HP system?