What does this mathematical rebus means ?

O_er_t_o_

Complete the missing letters of the given word.

In the four images below, can you find the odd one out?

A clock loses 10 minutes each hour. If the clock is set correctly at noon, what time is it when it reads 3 PM?

I make two people out of one. What am I?

John and Jill are madly in love with each other. To remind Jill of his pure love, John wants to send her a ring by post but in their country where burglary is quite prominent, any package that is not locked comes under the risk of being stolen for the contents.

John and Jill possess many padlocks but neither one of them has the other key.

Can you find a way John can send the ring to Jill safely?

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

which number am I?

On a bus, there is a 26-year-old pregnant lady.
A 30-year-old policeman.
A 52-year-old random woman.
And the 65-year-old driver.

Who is the youngest?

Spot 5 differences in two Christmas tree below:

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?