what does this picture(rebus) riddle means ?

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.

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

Count the number of balls in picture below:

What does the below image rebus riddle means ?

What is at the end of a rainbow?

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.

What can you hold in your right hand, but never in your left hand?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

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