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Let x be the Buddy age now.
Then Mark is (x+2) years old.
Then the condition states
(x+2) + 1 = 2(x+1).
Simplify and solve
x + 3 = 2x + 2
3 - 2  = 2x - x.
1 = x
ANSWER.  Buddy is 1 years old.  Mark is 1+2 = 3 years old.
CHECK.   In  a year  B= 2,   M = 3+1 = 4,  and  4 is twice as 2.   ! Correct !