A bag contains red balls and 30 blue balls. Also probability of picking a red ball is 0.25. Find the number of Red Bulls in the bag?
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Blue balls =30
Red balls =x
Total balls =30+x
Probability of red balls =
30+x
x
According to question,
30+x
x
=
13
7
⇒13x=210+7x
=6x=210
x=35
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