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Q.

A bag contains a number of marbles of which 80 are red, 24 are white and the rest are blue. If the probability of randomly selecting a blue marble from this bag is 15, how many blue marbles are there in the bag?


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a

25

b

26

c

27

d

28 

answer is B.

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Detailed Solution

Given, a bag contains 80 red, 24 white and the rest blue marbles, the probability of randomly selecting a blue marble from this bag is 15.
The Probabaility of red marble is PE=15
15=bluered+blue+white 15=blue80+24+blue 104+blue=5blue we get, 4blue=104
blue=26 Thus, there are 26 blue marbles in the bag.
Therefore, option (2) is correct.
 
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