CPM Homework Help : CCAA Problem 8-27

Mrs. Chen has two brothers. Mark is $7$ years older than Mrs. Chen and Eric is $11$ years younger than Mrs. Chen. The sum of all three of their ages is $149$ . Use the 5-D Process to determine the age of Mrs. Chen.

Hint:

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?

More Help:

If $C=\text{Mrs. Chen′s age}$ , $M=\text{Mark′s age}$ , and $E=\text{Eric′s age}$ one of the equations is $C+M+E=149$ .
Can you find the others?

Answer:

Mrs. Chen is $51$ years old.