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

There is one four-digit whole number n, such that the last four digits of n2 are the original number n

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

If six children and two dogs were under an umbrella, how come none of them got wet?

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

How many triangles are there in the picture below?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

You need to move three matchsticks to form three squares. Can you do it?