Felipe surveyed students at his school. He found that 78 students own cell phones and 57 of those students own an MP3 player. There are 13 students that do not own a cellphone, but own an MP3 player. Nine students do not own either device. Construct a two-way table summarizing the data.

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

At the electronics store you have a coupon for 20% off up to 2 cds you buy for cds with the original cost of $10.99 each the sales tax is 5% what is the total cost of your purchase

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?