How many times can you subtract the number two from the number fifty?

My location can be determined by the below rebus.
So where am i ?

Count the squares in the matchstick puzzle below?

What is next number in the pattern below:

131 517 192 123 ?

What is the fastest way to double your money?

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?

Find out the missing number in the picture attached:

Find the value of "?" in the ball picture Riddle below:

You have to put a letter on the following to make it a meaningful word. The only challenge is that you can't use 'E'.

S E Q U E N C _

How many words can a pen with half refill write?