A farmer has 240 bushels of beans for sale at a​ farmer's market. He sells an average of 16 1 4 bushels each day. After 5 ​days, what is the change in the total number of bushels the farmer has for sale at the​ farmer's market?

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?