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

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

What is the end of everything?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

A boy was driving a car, a girl took a lift from her. She asked his name. The boy said - my name is hidden in my car’s number, find it if you can. After this, she got down Car number was [ WV733N ] Can you guess the name now?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

What demands an answer, but asks no questions

Find the next number in the series.
1 10 24 43 67 ?