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

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

John and his wife were living in a rural place. On a particular day, John's wife fell ill and he called the local doctor. When the doctor picked up, he said, "Doctor, my wife is ill. She might have appendicitis."

"This can't be possible! I took out her appendix two years ago myself," the doctor explained.

When diagnosed, John's wife was found to have appendicitis. How can this be possible?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Two fathers and two sons decided to go to a shop and buy some sweets upon reaching. Each of them bought 1 kg of sweet. All of them returned home after some time and found out that they had 3kg of sweets with them.

They did not eat the sweets in the way, nor threw or lose anything. Then, how can this be possible?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Count the Triangle in the figure given below:

Can you decipher the two rows to find the hidden word?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

Why are all black people so quick ?