Question 384102
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Hi,         
A. 38 houses still available for sale with two floor plans: x(plan1) and y(plan2)
  x + y = 38

B. three times as many homes available with the second floor plan than the first
   substituting 3x for y
    $175,000*x + $200,000*y = $7,200,000

Note:  x = (38-y)
   $175,000*(38-y) + $200,000*y = $7,200,000
          25,000y = 550,000
                y = 22 and  x = 16   (38-22)