How many triangles are there on the puzzle below?

In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?

Solve the mathematical equation in the picture below.

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?

I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

Can you fill the blank with the correct number?

6 30 870 756030 _____

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

If,

Akriti = 631
Levis = 521
Sroti = 521
Aneel = 533
Then,
Sunil =?