Aleaking bucket is filled to 3/4 capacity. after some time, 1/2 of the water has leaked out. what fraction of the water leaked out of the bucket? a. 1/4 b. 2/3 c. 3/8 d. 3/16 heelpp its urgent

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?