By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?

How could a baby fall out of a twenty-story building onto the ground and live?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.

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?

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

Can you write down eight eights so that they add up to one thousand?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?