Eight of us go fourth, not back, to protect our king from an attack. What are we?

Solve the counting riddle by identifying the number of triangles in the given picture.

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

I am dry when I go inside, but wet when I am pulled outside.
The longer I am inside, the stronger I get
When I am completely out, I am wet and I literally sag
Who am I?

A boy purchased a book from a bookkeeper and gave him $100.
The cost of the book is $50 but the bookkeeper has no change, so he gets the change from the next shop and returns the boy his $50.

After some time the next shopkeeper came with the $100 note and told the bookkeeper that the note was a fraud, so he took the money back.

How much loss did the bookkeeper face?

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

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.

What does this mean?

CCCCCCC

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15