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

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

I am quite hot but become too cold if you remove the first two letters. What am I?

With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

What can you see in the middle of March and April that you can never see in any other month?

A time long back, there lived a king who ruled the great kingdom of Trojan House. As a part of the renovation of the kingdom to meet future security needs, he asked his chief architect to lay down a new play in a manner that all of his 10 castles are connected through five straight walls and each wall must connect four castles together. He also asked the architect that at least one of his castles should be protected with walls. The architect could not come up with any solution that served all of King's choices, but he suggested the best plan that you can see in the picture below. Can you find a better solution to serve the king's demand?

Which letter of the alphabet has the most water?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

A sundial has the fewest moving parts of any timepiece. Which has the most?