Login / Signup

Question

A bag contains 8 white and some black balls. If the probability of drawing a black ball from the bag is twice that of drawing a white ball, find the number of black balls in the bag.

A 15

B 10

C 17

D 16

Practice Next

More Probability Questions

Three houses are available in a locality. Three persons apply for the houses. Each applies for one house without consulting others. The probability that al...
A bag contains 5 red balls, 4 blue balls and 3 green balls. If one ball is drawn at random, what is the probability that the ball drawn is neither red nor ...
Three cards are drawn randomly from a pack of 52 cards. What is the probability that one will be black and two will be red?
A bag contains 5 red balls, 7 blue balls, and 8 green balls. If two balls are drawn at random without replacement, what is the probability that both are bl...
A box contains 3 red balls and 2 blue balls. Two balls are drawn at random without replacement. What is the probability (in percentage) that exactly one of...
A pair of dice is rolled once, what is the probability that the sum of the numbers on top is 5?
A piggy bank contains six 50 paise coins, nine Rs. 1 coin, and twelve Rs. 2 coins. One of the coins from the piggy bank fell and got lost. Find the probabi...
A box contains 5 red, 4 blue and 3 green balls. Two balls are drawn randomly without replacement. What is the probability that both balls are of the same c...
The ratio of sugar to flour packets in a store is 6:7. If 18 more packets of each are stocked, the ratio becomes 4:5. Find the original number of flour pac...
There are twelve boxes out of which only four boxes contain chocolates, and remaining boxes are empty. You picked one of the boxes randomly. Now the owner ...

Hey! Ask a query

ask-question

🎓

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)

Download Now 100% Free PDF