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

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

You bought me for dinner but never eat me. What am I?

If two fifty-foot ropes are suspended from a forty-foot ceiling that is twenty feet apart, how much rope will you be able to steal if you have a knife?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

You have to fill the below given grid in a manner that every row and column contains the digits 1 to 6. Also, make sure that the squares that are connected with each other must contains the same digit.

Can you find a five letter word that is left with only two letters if one is removed?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

What does this mean?

CCCCCCC