Question 400034
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Hi
total of 8 vehicles 
Let x and (8-x) represent the number of buses and vans respectively 
Question states***
 51x + 8(8-x) = 150
Solving for x
 43x + 64 = 150
    43x = 86
      x = 2, the number of buses.  6 vans  (8-2)
CHECKING our Answer***
 2*51 + 6*8 = 102 + 48 = 150