1 and 5.
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17 is the largest number that evenly divides both 102 and 85.
By adding .85 to it because .15+.85 = 1
85 82 35 15
It is: 1
85 is a composite number because numbers other then 1 and itself equally go into it. 5 x 17 = 85, so 5 and 17 both go into 85 making it a composite number. (All numbers ending in 5 are composite, because 5 goes into them.)