What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

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

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

A swan sits at the center of a perfectly circular lake. At an edge of the lake stands a ravenous monster waiting to devour the swan. The monster can not enter the water, but it will run around the circumference of the lake to try to catch the swan as soon as it reaches the shore. The monster moves at 4 times the speed of the swan, and it will always move in the direction along the shore that brings it closer to the swan the quickest. Both the swan and the the monster can change directions in an instant.
The swan knows that if it can reach the lake's shore without the monster right on top of it, it can instantly escape into the surrounding forest.

How can the swan successfully escape?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

Can you find out which triangle will have a bigger area among the following?
1. A triangle with sides 300, 400 and 500
2. A triangle with sides 300, 400 and 700

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

Identify The phrase in the picture.

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?