Are you a genius?

Mensa is a society for bright people and the only qualification to get in is to have a high IQ. Test your IQ with this tricky Mensa practice test. Get a pencil and paper ready because you’re going to need to write out your thoughts to find the answers to these questions. How many Mensa questions can you get correct?
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Question 1:

What is the 4-digit number in which the first digit is one-fifth of the last, and the second and third digits are the last digit multiplied by 3? (Hint: The sum of all digits is 12.)