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

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

What time is it when an elephant sits on a fence?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

Can you count the number of squares in the given picture?

Solve the mathematical equation in the picture below.

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

If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?

Can you fill the blank with the correct number?

6 30 870 756030 _____