Question
A box contains Z black balls and
7 white balls. If two balls are drawn at random, one after another without replacement, and the probability of drawing both black balls is 5/11 , find the value of Z.Solution
ATQ, 
Using the optional method: 
- The present ages of Priya and Tina are in the ratio 2:5, respectively. Eight years hence, the ratio of their ages will become 5:11. Find the present age of...
The current age ratio of Rahul to Sakshi is 3:2. Additionally, the ratio of Rahul’s age five years ago to Sakshi’s age ten ye...
The current age of 'Aman' is 87.5% greater than 'Bittu's' age. The ratio of Aman's age 3 years hence from now to Bittu's age 6 years hence from now is 8...
The average age of three partners - Neil, Olivia, and Pete - in a startup is 32 years. The ratio of Pete's to Quinn's current ages is 2:3, and Olivia's ...
Mohit is 4 years older than Nittu. The present age ratio of Nittu to Pawan is 11:6. Additionally, Mohit's current age is twice that of Pawan's. Based on...
The ratio of A and B present age is 5:3. The product of their ages is 6000. What will be the ratio of their ages after 4 years?
Average of present age of A and C is 29 years and C is 8 years younger than B. Ratio of present age of A to present age of B is 6:5. Find present age of B.
A train takes 10 seconds more to cross a 250-metre-long platform than it takes to cross a pole. If a car running at the speed of 40 m/s takes 55 seconds...
A man invested a sum of Rs. 25,000. He invested some part at 5% p.a. and remaining at 5.5% p.a.
How much money did he invest at 5% p.a.?
...
Ayush's current age is 25% greater than Ayushi's, and the difference between their ages is 8 years. What will be the ratio of their ages 8 years from now?
Relevant for Exams:
