Answer:
23
Explanation:
Set Thomas' age to be variable x.
Since Huilan is 3 times the age of Thomas, he is 3x.
3x + x = 92 (The sum of their age)
4x = 92
4x/4 = 92/4 (Isolate x)
x = 23
Extra information: Huilan is 69 because 23 x 3 = 69
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