What happened when the wheel was invented?

Can you find the thief by just looking at the picture below?

Count the number of triangles in the below picture?

An apple seller is hosting a competition. He offers 1000 apples and 10 boxes to the people who pass by. The challenge is to put those 1000 apples in the 10 boxes in such a manner that if he asks for any amount of apples, the person can directly give him the boxes or a combination of boxes. If the person can do it, he promises to give a thousand apples for free.

If you happen to pass by the apple seller, will you be able to win a thousand apples?

I have 50 feet long of cloth, I need to create 50 handkerchiefs each size of 1 foot. I take one minute to cut a 1-foot handkerchief. So how long will it take to cut 50 handkerchiefs?

Can you make a six-letter word using the letters N, A and B ?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

Bay of Bengal is in which state?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?