Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

Why Wine Glass Stem is so long?

What will you call your mother's brother's brother-in-law?

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?

John and Jenni are a married couple. They have two kids, one of them is a girl. Assume safely that the probability of each gender is 1/2.
What is the probability that the other kid is also a girl?

Hint: It is not 1/2 as you would first think.

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

I can sizzle like bacon,
I am made with an egg,
I have plenty of backbone, but lack a good leg,
I peel layers like onions, but still remain whole,
I can be long, like a flagpole, yet fit in a hole.

Can you find out which options fits best with the missing column?

Count the number of triangles in the given picture.