How many triangles can you find in this given picture?

I’m tall when I’m young, and I’m short when I’m old. What am I?

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

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

It is always ahead of me yet I can never see it. What is it?

How many times can you subtract the number 5 from 25?

What is wrong in the below Picture?

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?

A boy collects white seashells from the sea and brings them home every night. When he has enough of them, he decides to sell them to a trader.

The trader is ready to buy the shells and he asks the boy about the quantity. At this, the boy starts calculating. He has a giant box that contains 3 mini boxes. Two of them have another mini box inside. If the giant box can hold 50 shells, how many brown shells can he sell to the trader?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?