Can you find out the missing number in the grid?

Jim and Sarah are in a long-distance relationship. Jim buys an engagement ring for Sarah and wants to mail it to her. Unfortunately, the only way to ensure the ring will be received is to place a lock on the package. Jim has locks and Sarah has locks, but neither has keys for each other’s locks. How can they make sure the ring isn’t stolen?

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

What has many teeth, but cannot bite?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

Different lights make me strange by changing me into different sizes. What am I?

O_er_t_o_

Complete the missing letters of the given word.

They are three errirs in this question. Can you find them?

Solve this riddle by finding the odd one out from the rest.

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?