Can you make four (4) nines (9) equal 100?

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

You are provided with a grid (as shown in the picture). Can you fill the squares with numbers 1-8 in a manner that none of the two consecutive numbers are placed next to each other in any direction (vertically, horizontally or diagonally?)

If six children and two dogs were under an umbrella, how come none of them got wet?

I have branches, but no fruit, trunk or leaves. What am I?

What's the only room from which no one can enter or leave

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different. How do you measure 45 minutes?

In the image given, you can find several triangles. Can you count them all?

In a mathematical quiz, you are asked the following question:

Use three 9s in a mathematical expression without dividing or multiplying to form the number one.

Can you answer the question?

Find the next number in the following series:
6, 14, 26, 98, __?