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?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

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

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

On rolling two dices (six-sided normal dice) together, what is the probability that the first one comes up with a 2 and the second one comes up with a 5?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

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

Only Highly Attentive Can Spot The Ladder In This Library In 7 Seconds! Can You?

For an extra income, John decided to work at a Hotel for one hour daily. The manager offers him that they will pay him $11 after every 11 days.
However, John offered a different proposition to the manager. The offers stand as:
He will be paid just a penny on his first day.
Two pence will be paid on the second day,
Four pence will be paid on the third day.
And so on till the 11th day.

Should the Hotel manager accept his offer?

On a bright sunny day, two fathers took their son fishing in the lake. Each man and son were able to catch one fish. When they returned to their camp, there were only three fishes in the basket. What happened?

PS: None of the fish were eaten, lost, or thrown back.