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

If two fifty-foot ropes are suspended from a forty-foot ceiling that is twenty feet apart, how much rope will you be able to steal if you have a knife?

A man dies of old age on his 25 birthday. How is this possible?

What can go up a chimney down, but can’t go down a chimney up?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

There is something which you can be arrested for attempting but not for successfully completing.

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

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

Prove that twice of ten is the same as twice of eleven.

You are mixing a mixture of cement and Sand with five gallons of water. You have a garden hose giving you all the water you need. The problem is that you only have a four-gallon bucket and a seven-gallon bucket and neither has graduation marks. Find a method to measure five gallons.