Why is a river so rich ?

What does below Rebus say?

XLR8

Pronounced as 1 letter, And written with 3, 2 letters there are, and 2 only in me. I’m double, I’m single, I’m black blue and grey, I’m read from both ends, and the same either way. What am I?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

If 1+9+8=1, what is 2+8+9?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

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 = ?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

Find the number of squares in the below picture