I have eight fingers and two thumbs but I do not live. What Am I?

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

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

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

I’m orange, I wear a green hat and I sound like a parrot. What am I?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

Rearrange the letters in "new door" to make one word.

Can you count the number of triangles in the given picture?

Suppose we lay down two cups in front of you. One of the cups is filled with tea and the other one with coffee. Now we ask you to take a spoonful of tea and mix it with the coffee. At this moment, the coffee cup has a mixture of tea and coffee. You have to take that mixture (spoonful) and add it back to the tea.

Can you now tell if the cup of coffee has more tea or the cup of tea has more coffee?