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Home > CC2MN > Chapter 9 > Lesson 9.3.2 > Problem 9-110


Mrs. Chen has two brothers. Mark is years older than Mrs. Chen and Eric is years younger than Mrs. Chen. The sum of all three of their ages is . Use the 5-D Process to determine the age of Mrs. Chen.  

What are the equations you can write to relate the ages of Mrs. Chen, Mark, and Eric? How can you use these equations to find Mrs. Chen's age?

If , , and one of the equations is .
Can you find the others?

Mrs. Chen is years old.