Question 363852
Model Cars, Inc. makes red cars, white cars, and blue cars. THe profit on a blue car is $10 more than the profit on a white car, and the profit on a red car is $7 less than the profit on a white car. If the profit on 2 red cars is $2 less than the profit on one blue car, what is the profit on a blue car?

Let b = profit on a blue car
    w = profit on a white car
    r = profit on a red car

    b = w + 10     (1)
    r = w - 7      (2)
   2r = b -2       
  2r-b= -2         (3)
  
Subtract eq. (2) by 2q. (1)
   r - b = 0 - 7 - 10
   r - b = -17     (4)
Subtract eq. (3) by eq. (4)
   r - 0 = -2 - (-17)
       r = 15
in eq (2)
   r = w - 7
  15 = w - 7
   w = 22

in eq (1)
   b = w + 10
   b = 22 + 10
   b = 32

The profit on a blue car is $32