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?

If 1+9+8=1, what is 2+8+9?

Three friends decide to distribute the soda cans they had among them. When all of them had drunk four cans each, the total number of cans that remained was equal to the cans each one of them had after they had divided the cans.

Can you calculate the total number of cans before distribution?

Who is that with a neck and no head, two arms and no hands? What is it?

By using 'because' continuously three times, can you make an English statement ?

Find out the missing number in the picture attached:

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

Count the number of triangles in the given picture.

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

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?