Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

What Time Should the last watch show in the below figure?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

What is the next number in this series?

4,12,84,3612....

A man wants to cross the pit of fire which is 25 feet in length and he has 2 planks(fire resistant) 19 feet in length. How can he cross the pit of fire alive?

Can you count the number of blocks in the picture below?

In the figure, you can see nine stars. What you have to do is connect all of them by using just four line and without lifting your hand i.e. in a continuous flow.

Solve the puzzle by telling what does below picture means.

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?