Posted by Marty (F) on Monday, March 19, 2012 at 3:27am.
If the sequence is 20 x y 28 ... then
y = (20+x)/2 = 10 + x/2
28 = (20+x+y)/3 = (20+x+10+x/2)/3 = 10+x/2
18 = x/2
x=36
y=28
20 36 28 28 28 28
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