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8-27.

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.  Homework Help ✎

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.