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let A be the Austin age.
Then Kori's age is (A-2) years, according to the condition.
In 9 years Austin age will be (A+9) years, while Kori's age will be ((A-2) + 9) = A + 7 years.
The sum of their age in 9 years is 54 (given), producing the equation
(A+9) + (A + 7) = 54.
Simplify and solve for A
2A + 16 = 54
2A = 54 - 16
2A = 38
A = 38/2 = 19.
ANSWER. Austin is 19 years now.
Solved.