Using eight eights and addition only, can you make 1000?

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?

What word is represented by this rebus?

Find three numbers such that When we multiply three numbers, we will get the prime numbers. The difference between the second and the first number is equal to the third and second.

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

What word is pronounced the same if you take away four of its five letters?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

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.

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.