Spot what is wrong here in below Picture?

Which number should replace the question mark?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

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?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

What does a man do only once in his lifetime, but women do once a year after they are 29?

Can you identify the hidden rebus in the image below?

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?