If Sophia ate 1/6 of the pie, then 6/6 - 1/6 = 5/6 is left in the fridge.
Let x be the pie's original weight.
The current weight of the pie can be described by 5x/6=1200 grams
So, 5x=7200.
And, the original weight is x = <<1440=1440>>1440 grams.
So, Sophia ate 1440 grams original - 1200 grams after= <<1440-1200=240>>240 grams of pie.
#### 240