What has many keys but can’t open a single lock?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

Dr Doom invited a group of puzzle fanatics to a party which was oriented toward having puzzle-oriented games. At night, he introduced the guests to a 'unique riddle'. A prize was offered to the one who solved it first.

The guests included six people named Tom Paul, Fox Obama, Jeremy Reener, Alex Murphy, Prim Pastor, and Ellen Page. The winner of the 'unique riddle' contest was to be announced after the dinner. So Dr. Doom stood up and started the announcement:

'Okay now everybody!'
'The winner of�'
'The Hardest Riddle Ever Event'

But before he could complete it, the light went out and his voice was not heard without the mic by anyone. But they already knew who the winner was. Can you deduce the name of the winner?

Spot 5 differences in two Christmas tree below:

Can you find a rabbit in the given picture?

Solve the equation in the image by looking at the pattern closely.

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...

How many triangles are there on the puzzle below?

What kind of storm is always in a rush?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?