Question
A bag contains 30 white and some black balls. If the probability of drawing a black ball from the bag is 1.4 times that of drawing a white ball, find the number of black balls in the bag.
More Probability Questions
- 18 rotten bananas are accidentally mixed with 132 good ones. It is not possible to just look at a banana and tell whether or not it is rotten. One banana i...
- A bag contains 7 red gems, 8 yellow gems and 5 green gems. 3 gems are drawn randomly. What is the probability that the gems drawn contain gems of different...
- 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 n...
- Bag A contains 4 red and 6 blue balls, while Bag B contains 7 blue and 5 yellow balls. If one ball is drawn from bag 'A' and bag 'B', respectively, at rand...
- The probability of selecting a rotten egg randomly from a basket of 1200 eggs is 0.22. What is the number of rotten eggs in the basket?
- A bag contains 6 black and 8 white balls. One ball is drawn at random. What is the probability that the ball drawn is white?
- There are 80 balls of three different colours in a bag out of them 18 are red and 30 are blue. Find the probability of drawing a black ball (third colour) ...
- A bag contains 3 black and 9 white balls. One ball is drawn at random. What is the probability that the ball drawn is white?
- The probability that Neha passes the exam is (3/7) and the probability that Arjun fails the exam is (4/9). If both give the exam, find the probability that...
- Two fair six-faced dice are thrown simultaneously. Find the probability that the sum of the numbers is 10,
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)