A bag contains 13 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.
Given, Number of white balls = 13 Let x be the number of black balls. Total number of balls in the bag = 13 + x Also, the probability of drawing a black ball from the bag is twice that of drawing a white ball. ⇒ x/(13 + x) = 2[13/(13 + x)] ⇒ x = 26 Hence, the number of black balls in the bag = 26.
Two numbers are less than a third number by 40% and 46% respectively. Find the percent by which the second number is less than the first.
The monthly income of Vivek and Sohan together is Rs. 46000. The income of Vivek and Sohan is increased by 20% and 30% respectively. The new income of ...
There are 100 students in a particular class. 55% students play rugby, 30 % play basketball and 15% play both the games. What is the number of students ...
The population of a city is decreased by 14% in the first year and then increased by 21% in the second year. Find the population of the city at the end...
In a train, 45% of the passengers are females. Out of total number of passengers, 65% have unreserved tickets out of which 45% are females. How much per...
A man spent 40% of his income in May. If his savings is increased by 20% in June and becomes Rs. 5760, then find the income of man in May.
75% of A is equal to 40% of C and 80% of B is equal to 100% of A. If sum of 50% of B and 30% of C is equal to 95, then find 80% of A.
A scored 40% marks and failed by 40 marks whereas B scored 70% marks, which was 80 more than the passing marks of the examination. Find the total marks ...
Monthly income of P is Rs.14000 and his monthly savings is Rs.8500. If his monthly income is decreased by 30% and monthly expenditure is decreased by 25...
The monthly incomes of 'A' and 'B' are in the ratio of 3:4, respectively. Both 'A' and 'B' have identical monthly expenditures, while their monthly savi...
