What is the next number in the series?

15 29 56 108 208 ?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

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

A boy was locked in a room by some robbers. All that is in the room is a piano, a calendar, and a bed. The room is locked from the outside. What does he eat, drink, and how does he escape and get out?

What demands an answer, but asks no questions

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

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?