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

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

A bridge is about to collapse. There are four people P, Q, R and S on one of the sides. Before the bridge collapses, they want to cross it. Now since the bridge is too weak, it can only stand the weight of two people at a time. Also, it is night time and nothing is visible. They have just one torch with them.

Now P takes one minute to cross the bridge, Q takes two minutes to cross, R takes five minutes to cross and S takes ten minutes to cross.

The bridge will collapse in seventeen minutes. How will they be able to cross the bridge before it collapses?

Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

What is black when you buy it, red when you use it, and gray when you throw it away?

John was piloting a plane behind a car but was never able to overtake it. Why?

Can you write down eight eights so that they add up to one thousand?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?