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

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

What happened when the wheel was invented?

There were five men at church, and it started raining while they were outside. The four that ran still got wet, but the one that was still stayed completely dry. Why did he stay dry?

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

How many times in a given day, minutes and hour clock comes in a straight line ?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Count the number of triangles in the below picture?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?