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.
Given, Number of white balls = 20 Let x be the number of black balls. Total number of balls in the bag = 20 + x Also, the probability of drawing a black ball from the bag is 2.5 times that of drawing a white ball. ⇒ x/(20 + x) = 2.5[20/(20 + x)] ⇒ x = 50 Hence, the number of black balls in the bag = 50.
Who had scaled the Mount Denali and became the youngest Indian female to do so?
Banking ombudsman has been constituted under which of the following Act?
Angora wool is extracted from
A documentary named “A Son of Himalaya” is being made on the life struggle of a great personality of the state?
Which famous former Indian cricketer was born in Chandigarh?
एेतिहासिक ' हल्दी घाटी का युद्ध ' कब लड़ा गया ?
Who is the writer of the novel “The Guide”?
What is India's rank in recently released Environment Protection Index?
Which one of the following rivers was known as the ‘Sorrow of Bengal’?
The largest state of the country India is?