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?

Can you count the number of quadrilaterals in the picture below?

I am white when I am dirty, and black when I am clean. What am I?

Can you find out the total number of triangles in the given figure?

What is the word or phrase?

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

John speaks the truth only once a day in a week. Below are a few hints for you:

First: Days are Sunday, Monday and so on.
Second: One day he says, "I lie on Monday and Tuesday".
Third: On the next day, he says, "Today is either Thursday, Saturday or Sunday".
Fourth: On the next day, he says, "I lie on Wednesday and Friday".

Can you identify the day on which he speaks the truth?

Why is it very easy to weigh a fish?

What word begins and ends with an E, but has only one letter?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?