I am helping a friend at her store and she is having a sale. I am selling shirts and a pair of socks with a gift set. Each t-shirt cost $10 and each pair of socks cost $1.00. At the end of the day we made $110. I sold a total of 20 t-shirts and pairs of socks combined. How many t-shirts were sold and how many pairs of socks were sold?

Figure abcd is a parallelogram. if point c lies on the line x = 2, what is the y-value of point c?

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?

21 a stick 7 inches long is broken into two pieces, so that one piece is twice as long as the other one. how long are the two pieces?