Let's use age-related variables to represent the ages of Huilan and Thomas.
Huilan's age: h
Thomas's age: t
We are given that Huilan is 15 years older than Thomas, which can be expressed as:
h = t + 15
We are also given that the sum of their ages is 94, which can be expressed as:
h + t = 94
Now we have two equations and two unknowns. We can solve for t (Thomas's age) by substituting the first equation into the second equation.
(t + 15) + t = 94
Combining like terms, we get:
2t + 15 = 94
Subtracting 15 from both sides, we get:
2t = 79
Dividing both sides by 2, we get:
t = 39.5
Therefore, Thomas's age is 39.5 years.