Amap shows the distance between dallas and houston as 3 inches. the actual distance is 240 miles. if there are 63,360 inches in a mile, find the ratio of the distance on the map to the actual distance between dallas and houston.

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?