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?

Why do we preferably have round manhole covers and not square ones?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

Count the Triangle in the figure given below:

I am a word of 12 alphabets.

* Alphabets 12, 4, 7, 2, 5 : Eastern beast of burden
* Alphabets 1, 8, 10, 9 are street made famous by Sinclair Lewis.
* Alphabets 11, 3, 6 are past.

On whole it means a person suffering from delusions of greatness.

What Is it ?

Do you know who was buried in John's tomb?

Find the smallest sentence with all the English alphabet.

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"