How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

Two trains start at the same time, one from Bangalore to Mysore and the other from Mysore to Bangalore. if they arrive at their destinations one hour and four hours respectively after passing one another, how much faster is one train running than the other?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

Find the value of "?" in the ball picture Riddle below:

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?