Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

What is the next number in the series?

15 29 56 108 208 ?

You need to arrange three 7 and mathematical symbols to form number 1?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

Can you count the number of squares in the given picture?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?