4 bags have 4 x 20 = <<4*20=80>>80 apples.
And, six bags have 6 x 25 = <<6*25=150>>150 apples.
Thus, Ella has 80 + 150 = <<80+150=230>>230 apples in all.
Therefore, Ella has 230 - 200 = <<230-200=30>>30 apple left.
#### 30