You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

If I put in one bird per cage, I have one bird too many. If I put in two bird per cage, I have one cage too many. How many cages and birds do I have?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

What occurs twice in a week, once in a year but never in a day?

Why is the longest human nose just 11 inches?

what does the below math rebus puzzle mean?

I have feet, but no legs. Which animal Am I?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?