By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

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

What number do you get when you multiply all of the numbers on a telephone's number pad?

What has many keys but can’t open a single lock?

Three friends decide to distribute the soda cans they had among them. When all of them had drunk four cans each, the total number of cans that remained was equal to the cans each one of them had after they had divided the cans.

Can you calculate the total number of cans before distribution?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

To attend world science seminar, A famous chemist from Mexico visit
London. In the lab, the scientist was killed and his six assistants were under suspicion of killing the chemist.
Name of six assistants: Austin, Wayne, Dege, Oscaru, Lingard, and Rojo.
He left a note "76-20-44 79-16-22-7"

A local detective Jack was called to solve the case,

After reading the note, Jack instantly asked the police to arrest the murderers.

Who are the murderers?

John was drowned by he was not wet. How?