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

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

Take away the whole and some still remain. What is it?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

What you cannot hold but it is yours?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

You are given four tennis balls and asked to arrange those balls in a manner that the distance between each one of them is exactly equal. How will you do it?

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

What has many keys but can’t open a single lock?

Solve the equation in the image by looking at the pattern closely.