Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

Rearrange the letters in "new door" to make one word.

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT

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

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

Birbal was jester, counsellor, and fool to the great Moghul emperor, Akbar.
The villagers loved to talk of Birbal's wisdom and cleverness,
and the emperor loved to try to outsmart him.
One day Akbar (emperor) drew a line across the floor.
"Birbal," he ordered, "you must make this line shorter, but you cannot erase any bit of it."
Everyone present thought the emperor had finally outsmarted Birbal.
It was clearly an impossible task.
Yet within moments the emperor and everyone else present had to agree that Birbal had made the line shorter without erasing any of it.
How could this be?