What is the Surname of Barbie Doll?

Using Only Five 5's and any mathematical operator make sum as 37

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?

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?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

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

What does below chemistry rebus means?

You walk into a creepy house by yourself. There is no electricity, plumbing, or ventilation. Inside you notice 3 doors with numbers on them. Once you open the doors you will die a particular way. Door No.1 You’ll be eaten by a lion who is hungry. Door No.2 You’ll be stabbed to death. Door No.3 There is an electric chair waiting for you. Which door do you pick?

Can you find the thief by just looking at the picture below?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?