Question 1173700
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Hi,
Sarah's uncle Max is twice as old as she is. 
*Let x be Sarah's age NOW and Max's age NOW be 2x.  
Twelve years ago, Max was three times as old a Sarah. 
(2x-12) = 3(x-12)
2x-12 = 3x - 36
   24 = x     Sarah is 24  and Max is 48
checking our work.
12 years ago...
 36  = 3*12 = 36  checks
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