Move four matchsticks to the below square to form three squares?

You are mixing a mixture of cement and Sand with five gallons of water. You have a garden hose giving you all the water you need. The problem is that you only have a four-gallon bucket and a seven-gallon bucket and neither has graduation marks. Find a method to measure five gallons.

If two's company, and three's a crowd, then whats four and five ?

John has eleven friends. He has a bowl containing eleven apples. Now He wants to divide the eleven apples among his friends, in such a way that an apple should remain in his bowl.
How can He do it?

Count the number of triangles in the picture below:

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?

What 8 letter word can have a letter taken away and it still makes a word. Take another letter away and it still makes a word. Keep on doing that until you have one letter left. What is the word?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

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

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3