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 

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