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

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

A boy was locked in a room by some robbers. All that is in the room is a piano, a calendar, and a bed. The room is locked from the outside. What does he eat, drink, and how does he escape and get out?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

A worker is to perform work for you for seven straight days. In return for his work, you will pay him 1/7th of a bar of gold per day. The worker requires a daily payment of 1/7th of the bar of gold. What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?

Open a Laptop which is password protected. Hint for the password is given as below:

1 mobile 3 books 2 Boards 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches

John is the son of Jacob.
So,
Jacob is the_____of John's father?

What jumps when it walks and sits when it stands?

What has hands, but can’t clap?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?