What has many keys but can’t open a single lock?

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?

I know a nine-letter word having only one vowel.
Do you ?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

In a kingdom, King George did not allow any citizen to visit the world outside. Also, only a person with proper paperwork was allowed to enter or he was sent back. A wooden bridge was what connected the kingdom to the world. The king had appointed a sharpshooter who would check the every five minutes on the bridge to check. After checking, he would go back to his hut and return exactly after five minutes again. The bridge took 9 minutes to cross.

A merchant was able to escape the kingdom without harming the shooter. How?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).

Which word does the below Plexor means ?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?