Maths Crack the Code and Open the Lock

It contains very interesting crack the code #puzzles. Most of the crack the code puzzles are generally logical. However, these crack the code puzzles are mathematical. You need to do the mathematical calculations to solve these crack the code brain teasers. 
In these puzzles, you will be shown some statements which give hints about the 3 digit code. Your challenge is to guess the 3 digit code which will open the lock. So can you crack the code and open the lock?

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