The flower shop sold 45 + 20 = <<45+20=65>>65 daisies on the second day.
Twice the number of flowers on the second day is 65 x 2 = <<65*2=130>>130.
So, the flower shop sold 130 - 10 = <<130-10=120>>120 daisies on the third day.
The total daisies sold for 3 days was 45 + 65 + 120 = <<45+65+120=230>>230.
Therefore, 350 - 230 = <<350-230=120>>120 daisies were sold on the 4th day.
#### 120