A father's child, a mother's child, yet no one's son.

Who am I?

The more of this there is, the less you see. What is it?

A new clothing store has a unique method of pricing items. A vest costs $20, a tie costs $15, a blouse costs $30, and underwear costs $45. How much would pants cost?

What is black when you buy it, red when you use it, and gray when you throw it away?

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?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?

When it's bad luck to meet a black cat?

What's the best place to go shopping in the ocean?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?