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The ages of 3 children in our family total 32 years . 
I am twice as old as my sister and my brother is 2 years older than I am .How old am I
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Let x = your age.
The syster age is  
  years;  the brother's age is (x+2).
An equation for the total age is
    x + 
 + (x+2) = 32,
or
    2x + x + 2(x+2) = 64
    5x + 4 = 64
    5x     = 64 - 4 = 60.
     x              = 60/5 = 12 years.    ANSWER
Solved.