A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

What is the longest word in the dictionary?

Can you divide the below-given shape into four equal and identical pieces?

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?

Count the number of lines in the image below ?

Whats the next number in the below number sequence pattern.

What begins with T, ends with T, and has T in it?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?