Question 411552
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Hi
Mark is 8 years younger than Jerry
Let x and (x-8) represent Jerry and Mark's ages respectively
Question states*** In 10yrs...
 (x-8) + 10 = 1/2(x+10)+10
Solving for x
 (x-8) + 10 = 1/2*x + 5 +10
   x/2 = 13
   x = 26yr, Mark's age NOW.  'Jerry' is now 18yr.  (26-8)

CHECKING our Answer***
      28 = 1/2(36) + 10 = 18 + 10