Helga writes 5 x 2 = <<5*2=10>>10 articles per hour.
And she can write 10 x 4 = <<10*4=40>>40 articles every 4 hours.
So, the total number of articles she usually writes for a week is 40 x 5 = <<40*5=200>>200 articles.
She was able to write 10 x 2 = <<10*2=20>>20 articles on her extra 2 hours last Thursday.
And she was able to write 10 x 3 = <<10*3=30>>30 articles on her extra hour last Friday.
So, the total number of articles she was able to write on her extra hours is 20 + 30= <<20+30=50>>50.
Therefore, she was able to write a total of 200 + 50 = <<200+50=250>>250 this week.
#### 250