By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

John is found dead in his office at his desk. The police have narrowed the suspects down to three people: Mrs. Jacob, John’s wife Hena and his business partner Jason . All three visited John on the day of his murder, but all three provide the police with stories of explanation as to the reason for their visit.
Police found John with his wrist watch still on his right arm, a torn up picture of his wife laying on the floor beside the trash can, and an ink pen in his right hand. On the desk, the police found a name plate, a telephone that was off the hook, and a personal calendar turned to the July 5th page with 7B91011 written on it. After examining this evidence, the police knew their suspect. Who was it ?

Find the next number in the series

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

I have Rs.50 and I spend it in the way as below.

John has played 50 ODI's and his average is 50. How many runs should he score in his 51st ODI, so that his average score jumps to 51?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

I’m tall when I’m young, and I’m short when I’m old. What am I?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

French Police inspects a room where there are no windows, no doors, no tables and is almost empty expect there is just a puddle of water. They found a dead man who obviously hung herself from the ceiling, but they are not able to figure out how this had happened.

John and Jacob entered the crime scene and easily able to solve the case.

How did the man die?

Find the hidden tiger in the given optical illusion ?