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

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

I welcome the day with a show of light, I stealthily came here in the night. I bathe the earthy stuff at dawn, But by noon, alas! I'm gone.

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

Before Mount Everest was discovered, what was the highest mountain in the world?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

What word is represented by this rebus?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Suppose we lay down two cups in front of you. One of the cups is filled with tea and the other one with coffee. Now we ask you to take a spoonful of tea and mix it with the coffee. At this moment, the coffee cup has a mixture of tea and coffee. You have to take that mixture (spoonful) and add it back to the tea.

Can you now tell if the cup of coffee has more tea or the cup of tea has more coffee?