Follow the process for establishing a set of equations: 1. Choose a variable to represent one of the unknowns.
2. Express the remaining unknowns in terms of the variable you chose in step 1. Look for a relationship between
the unknowns given in the problem.
3. Write an equation. (Look for the other relationship given in the problem.)
The tens digit of a number is twice the ones digit. The sum of the digits in the number is 12. What is the number?
Include the entire process for establishing a set of equations, the solution, and an explanation of what the solution
means in terms of the variables. Complete your work in the space provided.