A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number

A: I do not know your number.
B: Nor do I know your number.
A: Now I know.

What are the four solutions for this?

Using Only Five 5's and any mathematical operator make sum as 37

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

If your uncle’s sister is not your aunt, what relation is she to you?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

What part of the chicken has the most feathers?

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

What is next number in the pattern below:

131 517 192 123 ?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?