The ratio of the number of red balls , to yellow balls , to green balls in an urn is 2 : 3 : 4 . What is the probability that a ball chosen at random from the urn is a red ball ?

After replacing an old member by a new member , it was found that the average age of five members of a club is...

Difference between two numbers is 2 and their sum is 4. Then what is the difference of their square ?

If for integer x, 5 < x < 10 and y = x + 5. What is the greatest possible value of x + y ?

In an election a candidate who gets 84% of the votes is elected by a majority of 476 votes. What is the total...

The selling price of 15 items equals the cost of 20 items. What is the percentage profit earned by the seller...

One third the sum of 13 and a certain number is the same as one more than twice the number . Find out the numb...