Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

Sally lives in a place where six months of the year is mild summer and the temperature drops significantly the other six months. She owns a lake where there is a small island. She wants to build a house on the island and needs to get materials there. She doesn’t have a boat, plane, or anything to transport them to the island. How does Sally solve this problem?

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

Can you count the number of triangles in the given picture?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

How can you take 2 from 5 and leave 4?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?

There is a square piece of paper with a hole that is denoted by the circle on the top right side in the given picture. You have to cut the paper in a manner that it forms two and only two separate pieces of paper and then rearrange the pieces in a manner that the holes come in the centre of the paper.