Can you start the fire using two pieces of wood?

There is a box. The area of its top is 240 square units, the area of the front is 300 square units and the area of the end is 180 square units.

Can you calculate the dimensions of this box with the given data?

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

How many times in a given day, minutes and hour clock comes in a straight line ?

John: "Hi Teacher, What is your favourite movie ?".
Chemistry Teacher: "Indium Cerium Platinum Iodine Oxygen Nitrogen".
Ten seconds later... John replied I got it.

Do you?

Why did the Girl throw the butter out of the window?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.