If it took eight men ten hours to build a wall, how long would it take four men to build it?

Can you count the number of lines in the below picture?

A worker is to perform work for you for seven straight days. In return for his work, you will pay him 1/7th of a bar of gold per day. The worker requires a daily payment of 1/7th of the bar of gold. What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

What is the word or phrase?

We are a group of eight brothers. We consider the weak, yet we protect the king in every battle. If we move ahead, we never turn back. Who are we?

What do you see in the given picture?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?