A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

I have teeth but i don't bite. Who Am I ?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

What does the below image rebus riddle means ?

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

What does a man do only once in his lifetime, but women do once a year after they are 29?

A clock loses 10 minutes each hour. If the clock is set correctly at noon, what time is it when it reads 3 PM?