Question
span >A bag contains 20 white and some black balls. If the probability of drawing a black ball from the bag is 2.5 times that of drawing a white ball, find the number of black balls in the bag.
More Probability Questions
- Two cards are drawn at random without replacement from a standard deck of 52 cards. Find the probability that both cards are red
- A bag has balls of three colours. It has 8 red balls, x green balls and y blue balls, If probability of picking one green ball and that of picking one blue...
- A bag contains 10 black, 8 red and 12 yellow balls. Two balls are randomly drawn from the bag, what is the probability that a red and a yellow ball are dra...
- A bag contains black and white balls, such that the probability of picking a black ball is 4/7. If the probability of picking two black balls without repla...
- A box contains 6 red balls, 5 green balls, and 4 blue balls. Two balls are drawn at random. What is the probability that one ball is red and the other is b...
- A box contains ‘x’ indigo, ‘x – 4’ violet and ‘x – 8’ blue balls. If two balls are drawn at random then probability of getting a violet ball and an indigo ...
- A bag contains 12 blue balls, 18 red balls, and 20 green balls. One ball is drawn at random. Find the probability that the ball drawn is either blue or gre...
- 24 defective pens are accidentally mixed with 120 good ones. It is not possible to just look at a pen and tell whether or not it is defective. One pen is t...
- A bag has x blue balls and 4 yellow balls. If the probability of picking a blue ball is 3/5, find the probability that two balls drawn at once are of diffe...
- If three socks are chosen at random, what is the probability that all are blue socks?
Relevant for Exams:
Hey! Ask a query
Please enter email id
The email must be a valid email address.
Please enter Mobile Number
Please enter valid Mobile Number
Please enter your Doubt
Think You're Ready for RBI Grade B?
RBI Grade B 2026 Phase 1 Memory Based Paper
- 200 Questions with Detailed Solutions
- Section-wise Coverage (GA, English, Quant & Reasoning)