A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball from the bag is thrice that of a red ball, the number of blue balls in the bag is:
10
15
20
25
Probability
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Question

A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball from the bag is thrice that of a red ball, the number of blue balls in the bag is: 1. 10 2. 15 3. 20 4. 25

KnowledgeBoat · Accepted Answer

Let the number of blue balls in the bag be x. Total number of balls in bag = x + 5 The probability of drawing a red ball and a blue ball are: The probability of drawing a blue ball is thrice (3 times) that of a red ball: Pb = 3 × Pr Substituting values we get: The number of blue balls in the bag is 15. Hence, option 2 is the correct option.

Mathematics

A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball from the bag is thrice that of a red ball, the number of blue balls in the bag is:
10
15
20
25

Probability

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A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball from the bag is thrice that of a red ball, the number of blue balls in the bag is:10152025

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A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball from the bag is thrice that of a red ball, the number of blue balls in the bag is:
10
15
20
25

The probability of getting a defective pen in a lot of 600 is 0.045. The number of defective pens in the lot is :
27
270
36
360