Name a key which is hardest to turn.

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Find the hidden panda in the image below.

Replace the question mark with the number below given a simple math problem.

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

The horse jumps over the king.
Strangely there is absolutely no scratch on him.

Can anyone explain, how is this possible?

What demands an answer, but asks no questions

A new clothing store has a unique method of pricing items. A vest costs $20, a tie costs $15, a blouse costs $30, and underwear costs $45. How much would pants cost?

Below, you can see some coding:
January = 1017
February = 628
March = 1335
April = 145
May = 1353
June = 1064
July = 1074
August = 186

Now deciphering the way it has been coded, can you find out how September will be coded?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?