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

You need to arrange three 7 and mathematical symbols to form number 1?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

A father's child, a mother's child, yet no one's son.

Who am I?

Which English verb becomes past tense just by rearranging the letters?

After teaching his class all about Roman numerals (X = 10, IX=9 and so on) the teacher asked his class to draw a single continuous line and turn IX into 6. The teacher's only stipulation was that the pen could not be lifted from the paper until the line was complete.

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

What has lots of eyes, but can’t see?

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?