There are forty elephants and they have forty-fore heads. How can this be possible?

What does this rebus mean?

O
N
C
E
TIME

Can you spot what's wrong with the following sentence?

PETER WAS ANGRY AT
HIMSELF BECAUSE HE
ACCIDENTALLY LEFT THE
THE KEYS TO HIS CAR
AT HIS FRIEND'S HOUSE.

10+10 and 11+11 can give you the same answer.

Explain how?

You can see it everyday, But cannot touch it at will. What is it?

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

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

In which direction should the missing arrow point?

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?

Decode the movie name from the below picture?