Question 430529
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Hi
six more cars then 18 wheel trucks. 
Let x and (x+6) represent the number of 18-wheel trucks and cars respectively
Question states*** 134 'wheels' in parking lot altogether
 18x + 4(x+6) = 134
Solving for x
       22x = 110
         x = 5, number of trucks.  there were 11 cars (5+6)
CHECKING our Answer***
  5*18 + 4*11 = 90 + 44 = 134 wheels