Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

You are provided with a grid (as shown in the picture). Can you fill the squares with numbers 1-8 in a manner that none of the two consecutive numbers are placed next to each other in any direction (vertically, horizontally or diagonally?)

An evil man kidnapped someone and made them take one of two pills. One was harmless, but the other was poisonous. Whichever pill the victim took, the kidnapper took the other one. The victim took their pill with water and died. The kidnapper survived. How did the kidnapper get the harmless pill?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

What's a single-digit number with no value?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

How many letters are in the alphabet?

John is looking at Jenifer, but Jenifer is looking at Jacob. John is married, but Jacob is not.

Is a married person looking at an unmarried person ?