PLEASE HELP!

Please work out this problem step by step

Multiply. write your answer in simplest form. 3/8 x 5/7

10% of 1,900,000. show me how you got the answer

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?