What is the centre of gravity?

Why 1729 is a magic number? Answer Logically.

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

I can be cracked, made, told, and played. What am I?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

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?

In a secret society, a buried chamber can be accessed only via a secret password. The password is seven characters long and comprises of just letters and numbers.

You find a code that can help you in cracking the password. The code says "You force heaven to be empty".

Can you deduce the password from that?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?