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Let x be the Sherry's age.
Then the Jeff's age is 2x years, according to the condition.
The equation for the total age is
x + 2x = 72.
Simplify and solve
3x = 72
x = 72/3 = 24.
ANSWER. Sherry is 24 years old. Jeff is 2*24 = 48 years.
Solved.