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?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

A woman lives in a Tall building thirty-six floors high and served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

What is next number in the pattern below:

131 517 192 123 ?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

Can you solve the below tricky visual equation?

Can you find the thief by just looking at the picture below?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

When is the top of a mountain similar to a savings account?