Question 1126607
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64 + x = 3*(18+x),   where x is the value under the question.


64 + x = 54 + 3x

64 - 54 = 3x - x


10 = 2x  ====>  x = 10/2 = 5 years.


<U>Answer</U>.  In 5 years.


<U>Check</U>.   In 5 years they will be  69 and 23 years old.   69 = 23*3.   ! Correct !
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