Greg bought 2 boxes of balloons. he used half of them to decorate his yard. he used 40 to decorate his porch. and used the rest inside his house. how many balloons did he use inside

Anyone know? will mark brainliest if correct

Which type of graph would allow us to compare the median number of teeth for mammals and reptiles easily

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?