Decode this picture on T-Shirt and tell what it says ?

Given below is simple addition with a defined pattern pattern:
7 + 7 = 2
8 + 8 = 4
8 + 5 = 1
6 + 9 = 3
10 + 11 = 9

Can you analyze the pattern and find out the answer for:

4 + 9 = ?

Can you tell a 3D object that has just two surfaces?

What word does this rebus represent?

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meta meta

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

I have eight fingers and two thumbs but I do not live. What Am I?

How many triangles can you count in the figure given?

Can it be possible to build a house that has all its four walls facing towards the South?

O_er_t_o_

Complete the missing letters of the given word.