What is the answer to this if jake got 70 skittles and jolly got 102 and gave away 49 how many does she has left. how many do they have in total

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have

The holiday party will cost $160 if 8 people attend. if there are 40 people who attend the party, how much will the holiday party cost

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?