Can you start the fire using two pieces of wood?

In the image given, you can find several triangles. Can you count them all?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

I travel all around the world but always stay in the corner. What am I?

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?