Find three whole, positive numbers that have the same answer when multiplied together as when added together.

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

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

Can you name some countries which do not have the alphabet 'A' in them?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

How can you take 2 from 5 and leave 4?