Ineed the answer as fast as possible.

I believe there are 210 blue counters in the bag im not sure but this is how i got this.

a whole will =1

1-.3=.7 
there are 90 blue counters in .3 and there are 2.33333(repeat) in .7 
 so i multipled 2.3333(repeat) by 90.  2.3333(repeat)*90=210
                           -hope i got it right and that this helps-
p.s. i know it was confusing i have a very different way of thinking, lol.