Janeth bought 5 x 20 = <<5*20=100>>100 round balloons.
She bought 4 x 30 = <<4*30=120>>120 long balloons.
So, she has a total of 100 + 120 = <<100+120=220>>220 balloons.
Since 5 round balloons burst, then there are only 220 - 5 = <<220-5=215>>215 balloons left.
#### 215