Question 398133
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Hi
Alex is 6 years older than Sara
Let x and (x+6) represent the ages of Sara and Alex NOW respectively
Question states*** 16 years ago...
 (x+6) - 16 = 3/2(x-16)
solving for x
    x - 10 = 1.5x - 24
       14 = .5x
       14/.5 = x
         x = 28, Sara's age NOW.  Alex is 34 NOW.   (28 + 6)

CHECKING our Answer***
 18 = 1.5 * 12 = 18