I have 2 bags of counters. The first bag contains 2 red counters and 1 blue counter. The second bag contains 1 red counter, 1 blue counter and 2 yellow counters. I take a counter at random from both bags, what is the probability that two counters will be the same colour?

What is the slope simplify your answer and write it as a proper fraction, improper fraction, or integer

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

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?