Acoat regularly sells for $59.00. it is on sale for 20% off. what is the sale price of the coat?

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

Asurvey of 2,000 doctors showed that an average of 3 out of 5 doctors use brand x aspirin.how many doctors use brand x aspirin

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?