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Let x be the Caleb age now.
Then the Wendy's age is (C-6) years.
In 4 years Caleb's age will be (C+4) years;
Wendy's age will be ((C-6)+4) = C-2 years.
The problem says
(C+4) + (C-2) = 64.
Solve this equation and get the answer.