She has 50 x 2 = <<50*2=100>>100 silver stickers.
And she also has 100 - 20 = <<100-20=80>>80 bronze stickers.
So, Miss Walter has a total of 50 + 100 + 80 = <<50+100+80=230>>230 stickers.
Therefore, her 5 students will have 230 / 5 = <<230/5=46>>46 stickers each.
#### 46