What has to be broken before you can use it?

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?

What has a ring but no finger?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

John is a strange liar.

He lies on six days of the week, but on the seventh day, he always tells the truth.

He made the following statements on three successive days:

Day 1: "I lie on Monday and Tuesday."
Day 2: "Today, it"s Thursday, Saturday, or Sunday."
Day 3: "I lie on Wednesday and Friday."

On which day does John tell the truth?

They are three errirs in this question. Can you find them?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"