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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 !