Our product and our sum always give the same answer. Who are we?

Why do you find that most of the buildings are deprived of the 13th floor?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

What does below Rebus mean ?

esgg sgeg gegs gsge

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

Client Dempsey living in one of the East Coast states of the U.S. was talking to Landon Donovan, who was living in the West Coast state of the U.S.

Dempsey: What time is it?
Donovan: Wow, It is the same time here.

How is this possible?

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