Question 418226
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Hi
Let x represent the number in the original group
Question states***
 160/x - 160/(x+1) = $8
Solving for x
160(x+1) - 160x = 8x(x+1)
  8x^2  + 8x -160 = 0
   x^2 + x - 20 = 0   
  (x+5)(x-4)=0   x = 4  |tossing out negative solution for count

CHECKING our Answer***
 160/4 - 160/5 = $40 - $32 = $8