Fido weighs 26 pounds more than fifi. fifi weighs 12 pounds less than rover. if the sum of their weights is 71, how much does fifi weigh?

Hey there,
Let's say Rover's weight is x,
Rover = x
Fifi = x - 12 
Fido = x - 12 + 26
x + x - 12 + x - 12 + 26 = 71
3x - 12 - 12 + 26 = 71
3x + 2 = 71
3x = 71 - 2
3x = 69
x = 69 / 3
  = 23
Fifi = 23 - 12
      = 11 pounds

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