Find the hidden tiger in the given optical illusion ?

Do You See It?

Find the next number in the series below

21 32 54 87 131 ?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Ten coins have been arranged as you can see in the given picture. In this arrangement, a triangle is formed pointing upwards. You have to invert the position of the triangle and make it point downwards while changing the position of 3 coins only. Can you do it?

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?

Can you find the key in the picture below?

Through your logical capabilities, can you make 7 an even?

If eleven plus two equals one, what does nine plus five equal?