Cristina was born in 1888. She just had her 30th birthday today how did that happen?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

A sundial has the fewest moving parts of any timepiece. Which has the most?

A man dies of old age on his 25 birthday. How is this possible?

Which number should replace the question mark?

I have two sand hourglasses:
1. A 7 minute one and
2. An 11-minute one.

Using just these 2 sand hourglasses, how can I measure time as 15 minutes?

Count the Triangle in the figure given below:

Steffi's daughter Jazelle needs to be picked up from school every day.
Steffi asks one of her colleagues to pick up Jazelle from the school. Steffi devised a password system to confirm that Jazelle goes with the correct colleague only.

The password on Monday was SJM16.
The password on Wednesday was TAW39.

What will the password be for Friday?

I am a number I am not an odd number I am higher than 90 I am not higher than 100 If you subtract me from 100, you get nothing. What number am I?

What does this Rebus Picture mean?