Alice is constructing rectangular prisms to represent buildings in a diorama for her social studies class.

The length of each rectangular prism exceeds the width by 6 cm.
The height of each rectangular prism is 5 cm less than the width.
The volume of each rectangular prism must be less than or equal to 50 cm .
What are the possible width values in centimeters for each rectangular prism?

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?