Be active and find the killer in the picture Riddle below.

Count the squares in the matchstick puzzle below?

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

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

Which part of London exists in France as well ?

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?