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?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

Bopanna was working on a murder case when he received a message about the location of the murder weapon.
The message was encrypted as below.

"deb mitciv eht edisni neddih si nopaew redrum ehT"

Tell me the location of the murder weapon.

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

John is 45 years older than his son Jacob. If you find similarities between their ages, both of their ages contain prime numbers as the digits. Also, John's age is the reverse of Jacob's age.

Can you find their ages?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Replace the question mark with the correct number in below Picture:

Can you find out the number that should replace the question mark with a valid reason?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

I add 5 to 9 and get 2. The answer is correct, so what am I?