When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

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 science lab, a petri dish hosts a healthy colony of yeast for an experiment. Now every minute, all the yeast cells divide into two. At noon, there was just a single cell of yeast and at 1:22, the Petri dish was half full. Can you calculate when the dish will be full of yeast?

I am sometimes honest
Sometimes dishonest
I can be sweet and also bitter
I can hurt you real bad and
also make u smile and blush ☺️
What am I?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?