Multiple choice

A bag contains a number of marbles of which 80 are red, 24 are white & rest are blue. If the probability of randomly selecting a blue marble from this bag is 1/5, how many blue marbles are there in the bag?

  1. 25

  2. 26

  3. 27

  4. 28

  5. 29
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let the total number of marbles be x.

Then, according to question, (x - 104) / x = 1/5

Solving for x, gives, x = 130

No. of blue balls = 130 - 104 = 26

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