Ruby ate 1/3 of a pizza and angie ate one fifth of the pizza how much of the pizza did they eat in all

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

How do you solve a question like this?

Val and tony get paid per project. val is paid a project fee of $44 plus $12 per hour. tony is paid a project fee of $35 plus $15 per hour. write an expression to represent how much a company will pay to hire both to work the same number of hours on a project.