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

There's a day, that comes around once a year.
To celebrate the man, you hold dear.
He gave you life, love and will pick you up if you fall.
When it comes to guys like him, He's the best of all.
Who is he?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

I have Rs.50 and I spend it in the way as below.

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

I am a number I am not an odd number I am higher than 90 I am not higher than 100 If you subtract me from 100, you get nothing. What number am I?

what does this below rebus represent identXQQQQQME

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

I travel all around the world but always stay in the corner. What am I?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?