Let Lyle's age be represented by \( x \). Since their ages are three consecutive even numbers, we can express the ages of Katrina and Mari in terms of \( x \):
- Lyle's age: \( x \)
- Katrina's age: \( x + 2 \)
- Mari's age: \( x + 4 \)
According to the problem, the combined age of Lyle, Katrina, and Mari is 66. Therefore, we can write the equation:
\[ x + (x + 2) + (x + 4) = 66 \]
Now, you can simplify and solve this equation to find Lyle's age \( x \).