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loganstadnyk
28% If you take 7 and divide it by 25 (complete amount) and times it by 100 you get the percentage.
VenusRetrograde
Answer=28%
Assuming you meant to say that 7 of them were blue, and the rest were purple...

  7      x
___=___
 25   100

cross multiply
25x=700
x=28