You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.

What is greater than gold but cannot be bought. it can never be sold and can earn if its sought. though it can be broken, it can still be fixed. for by birth it can't start nor by death it is ended.what am i?

When monkey rotate the gear, which mark will be hit 1 or 2 ?

What does below Rebus mean ?

esgg sgeg gegs gsge

I am white when I am dirty, and black when I am clean. What am I?

why number 8549176320 is one of a kind?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

What is the word or phrase?

There was a minor accident with a doctor's son but the doctor noticed no major injury. After the treatment, the father of that doctors son is sitting with the son of the doctor without the doctor being in the room.

How can this be possible?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?