What goes up but never comes down?

You have $100 with you and you have to buy 100 balls with it. 100 is the exact figure and you can't go below or above the numbers and you have to use the entire $100. If there is no kind of tax applied how many of each of the following balls will you be able to buy:

Green Balls costing $6
Yellow Balls costing $3
Black Balls costing $0.10

Now, how many of each must you buy to fulfil the condition given?

A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

Which digit occurred maximum times between the number 1 and 1000?

What do you see in the image below

A horse was tied to a rope 5 meters long and the horses food was 15 meters away from the horse. How did the horse reach the food?