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Home > CCA2 > Chapter 10 > Lesson 10.3.2 > Problem 10-177


The sum of the digits of a two-digit number is , and when the digits are reversed the difference between the new number and the original is .

  1. If you use to represent the tens digit, and to represent the units digit, how can you represent one of the numbers?

  2. How can you represent the number with its digits reversed, still using  and ?

    See part (a). What effect does reversing the digits have?

  3. Use the information from the problem and parts (a) and (b) to write two equations that can be used to solve this problem.

    How do you write an equation to find the sum of the digits?
    How do you write an equation to find the difference of the numbers?

  4. What are the two numbers?