What is next number in the pattern below:

131 517 192 123 ?

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

How many times in a given day, minutes and hour clock comes in a straight line ?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

Find the missing number in the series below

13 -21 34 -55 ? -144

You have to put a letter on the following to make it a meaningful word. The only challenge is that you can't use 'E'.

S E Q U E N C _