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Let x = age of his cousin.
Then Jordan's age is (2x-3).
The equation for the sum of their ages is
    x + (2x-3) = 48
Simplify and find x
    3x = 48 + 3
    3x = 51
    x = 51/3 = 17.
ANSWER.  Jordan is  2*17-3 = 31 years old.